| **Business and Summary of Significant Accounting Principles (Policies)**            | 3 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
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| **Organization, Consolidation and Presentation of Financial Statements [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| Principles of Consolidation                                                         | Principles of ConsolidationOur consolidated financial statements include the consolidated accounts of GCI and its wholly owned subsidiaries, The Alaska Wireless Network, LLC ("AWN") of which we owned a two-third interest through February 2, 2015 when we purchased the remaining one-third interest, and four variable interest entities (“VIEs”) for which we are the primary beneficiary after providing certain loans and guarantees.  These VIEs are Terra GCI Investment Fund, LLC (“TIF”), Terra GCI 2 Investment Fund, LLC (“TIF 2”), Terra GCI 2-USB Investment Fund, LLC (“TIF 2-USB”) and Terra GCI 3 Investment Fund, LLC (“TIF 3”).  We also include in our consolidated financial statements non-controlling interests in consolidated subsidiaries for which our ownership is less than 100 percent.  All significant intercompany transactions between non-regulated affiliates of our company are eliminated.  Intercompany transactions generated between regulated and non-regulated affiliates of our company are not eliminated in consolidation.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| Non-controlling Interests                                                           | Non-controlling InterestsNon-controlling interests represent the equity ownership interests in consolidated subsidiaries not owned by us.  Non-controlling interests are adjusted for contributions, distributions, and income and loss attributable to the non-controlling interest partners of the consolidated entities.  Income and loss is allocated to the non-controlling interests based on the respective governing documents                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| Acquisitions                                                                        | We have accounted for the AWN NCI Acquisition as the acquisition of a non-controlling interest in accordance with Accounting Standards Codification ("ASC") 810, Consolidation, and the Acquired ACS Assets as the acquisition of assets that do not constitute a business in accordance with ASC 805-50, Business Combinations - Related Issues.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| Recently Issued Accounting Pronouncements                                           | Recently Issued Accounting PronouncementsIn May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2014-09, Revenue from Contracts with Customers.  This new standard provides guidance for the recognition, measurement and disclosure of revenue resulting from contracts with customers and will supersede virtually all of the current revenue recognition guidance under GAAP.  The standard is effective for the first interim period within annual reporting periods beginning after December 15, 2016.  Early adoption is not permitted.  The standard permits the use of either the retrospective or cumulative effect transition method.  In April 2015, the FASB tentatively decided to defer for one year the effective date of ASU 2014-09 for public and non public entities reporting under GAAP. The FASB also tentatively decided to permit entities to early adopt the standard.  We are currently evaluating the impact of the provisions of this new standard on our financial position and results of operations.In February 2015, the FASB issued ASU No. 2015-02, Consolidation (Topic 810): Amendments to the Consolidation Analysis. The update is in response to accounting complexity concerns, particularly from the asset management industry. ASU 2015-02 modifies the consolidation evaluation for reporting organizations that are required to determine whether they should consolidate certain legal entities such as limited partnerships, limited liability corporations, and securitization structures (collateralized debt obligations, collateralized loan obligations, and mortgage-backed security transactions). The ASU is effective for public business entities for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2015. Early adoption is permitted, including early adoption in an interim period. The adoption of this guidance is not expected to have a material effect on our financial position or results of operations.In April 2015, the FASB issued ASU No. 2015-03, Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs. ASU 2015-03 requires an entity to present debt issuance costs related to a recognized debt liability in the balance sheet as a direct deduction from the carrying amount of the debt liability, consistent with debt discounts. The recognition and measurement guidance for debt issuance costs are not affected by the amendments in this update. For public business entities, this update is effective for financial statements issued for fiscal years beginning after December 15, 2015, and interim periods within those fiscal years. An entity should apply the new guidance on a retrospective basis. We expect to adopt this guidance when effective, and do not expect this guidance to have a significant impact on our financial position or results of operation, although it will change the financial statement classification of our debt issuance costs. |
| Regulatory Accounting                                                               | Regulatory AccountingWe account for our regulated operations in accordance with the accounting principles for regulated enterprises.  These accounting principles recognize the economic effects of rate regulation by recording cost and a return on investment as such amounts are recovered through rates authorized by regulatory authorities.  Accordingly, plant and equipment is depreciated over lives approved by regulators and certain costs and obligations are deferred based upon approvals received from regulators to permit recovery of such amounts in future years.  Our cost studies and depreciation rates for our regulated operations are subject to periodic audits that could result in a change to recorded revenues.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| Earnings per Common Share                                                           | Earnings (Loss) per Common ShareWe compute net income (loss) attributable to GCI per share of Class A and Class B common stock using the “two class” method.  Therefore, basic net income (loss) per share is computed by dividing net income (loss) applicable to common stockholders by the weighted average number of common shares outstanding during the period.  Diluted net income (loss) per share is computed by dividing net income (loss) by the weighted average number of common and dilutive common equivalent shares outstanding during the period.  The computation of the dilutive net income (loss) per share of Class A common stock assumes the conversion of Class B common stock to Class A common stock, while the dilutive net income (loss) per share of Class B common stock does not assume the conversion of those shares. Additionally, in applying the “two-class” method, undistributed earnings are allocated to both common shares and participating securities. Our restricted stock grants are entitled to dividends and meet the criteria of a participating security.We allocate undistributed earnings in periods of net income based on the contractual participation rights of Class A common shares, Class B common shares and participating securities as if the earnings for the period had been distributed. We do not allocate undistributed earnings to participating securities in periods in which we have a net loss. In accordance with our Articles of Incorporation, if and when dividends are declared on our common stock in accordance with Alaska corporate law, equivalent dividends shall be paid with respect to the shares of Class A and Class B common stock, including participating securities. Both classes of common stock have identical dividend rights and would therefore share equally in our net assets in the event of liquidation. As such, we have allocated undistributed earnings on a proportionate basis.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| Accounts Receivable and Allowance for Doubtful Receivables                          | Accounts Receivable and Allowance for Doubtful ReceivablesTrade accounts receivable are recorded at the invoiced amount and do not bear interest. The allowance for doubtful receivables is our best estimate of the amount of probable credit losses in our existing accounts receivable. We base our estimates on the aging of our accounts receivable balances, financial health of specific customers, regional economic data, changes in our collections process, regulatory requirements and our customers’ compliance with Universal Service Administrative Company rules. We review our allowance for doubtful receivables methodology at least annually.Depending upon the type of account receivable our allowance is calculated using a pooled basis with an allowance for all accounts greater than 120 days past due or a specific identification method.  When a specific identification method is used, potentially uncollectible accounts due to bankruptcy or other issues are reviewed individually for collectability.  Account balances are charged off against the allowance when we believe it is probable the receivable will not be recovered. We do not have any off-balance-sheet credit exposure related to our customers.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| Derivative Financial Instruments                                                    | Derivative Financial InstrumentsWe account for our derivative instruments in accordance with ASC 815-10, Derivatives and Hedging. ASC 815-10 establishes accounting and reporting standards requiring that derivative instruments, including derivative instruments embedded in other contracts, be recorded on the balance sheet as either an asset or liability measured at its fair value. ASC 815-10 also requires that changes in the fair value of derivative instruments be recognized currently in results of operations unless specific hedge accounting criteria are met. We have not entered into any hedging activities to date. We recognize all derivative instruments as either assets or liabilities in our Consolidated Balance Sheets at their respective fair values. Our derivative instrument (as described in Note 5) include stock appreciation rights, all of which have been recorded as a liability at fair value, and will be revalued at each reporting date, with changes in the fair value of the instruments included in our Consolidated Statements of Operations as Derivative instrument unrealized loss.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| Guarantee Liabilities                                                               | Guarantee LiabilitiesWe offer a device trade-in program, "Upgrade Now", which provides eligible customers a specified-price trade-in right to upgrade their device. Participating customers must have purchased a financed device using an Equipment Installment Plan ("EIP") from us and have a qualifying monthly wireless service plan with us. Upon qualifying for an Upgrade Now device trade-in, the customer's remaining EIP balance is settled provided they trade in their eligible used device in good working condition and purchase a new device from us on a new EIP.For customers who enroll in Upgrade Now, we defer the portion of equipment sales revenue which represents the estimated value of the trade-in right guarantee. The guarantee liabilities are valued based on various economic and customer behavioral assumptions, including the customer's estimated remaining EIP balance at trade-in, the expected fair value of the used handset at trade-in and the probability and timing of a trade-in. The fair value measurements used are considered Level 3 under the Fair Value Measurements framework.We assess facts and circumstances at each reporting date to determine if we need to adjust the guarantee liability. The recognition of subsequent adjustments to the guarantee liability as a result of these assessments are recorded as adjustments to revenue. When customers upgrade their devices, the difference between the trade-in credit to the customer and the fair value of the returned devices is recorded against the guarantee liabilities.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| Revenue Recognition                                                                 | Revenue RecognitionWirelessWe offer new and existing wireless customers the option to participate in Upgrade Now, a program that that is described above in Note 1(k). Upgrade Now is a multiple-element arrangement typically consisting of the trade-in right, handset, and one month of wireless service. At the inception of the arrangement, revenue is allocated between the separate units of accounting based upon each components' relative selling price on a standalone basis. This is subject to the requirement that revenue recognized is limited to the amounts already received from the customer that are not contingent on the delivery of additional products or services to the customer in the future. We recognize the full amount of the trade-in right’s fair value (not an allocated value) as the guarantee liability and the remaining allocable consideration is allocated to the handset and wireless service. We recognize revenue for the entire amount of the EIP receivable at the time of sale, net of the fair value of the trade-in right guarantee and imputed interest. See Note 1(k) for more information on guarantee liabilities.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| Use of Estimates                                                                    | Use of EstimatesThe preparation of financial statements in conformity with GAAP requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period.  Significant items subject to estimates and assumptions include the allowance for doubtful receivables, unbilled revenues, accrual of the USF high cost Remote area program support, share-based compensation, inventory at lower of cost or market, reserve for future customer credits, liability for incurred but not reported medical insurance claims, valuation allowances for deferred income tax assets, depreciable and amortizable lives of assets, the carrying value of long-lived assets including goodwill, cable certificates, wireless licenses,and broadcast licenses, our effective tax rate, imputed interest rate, purchase price allocations, deferred lease expense, asset retirement obligations, the accrual of cost of goods sold (exclusive of depreciation and amortization expense), depreciation, the derivative stock appreciation rights liability, guarantee liability, and the accrual of contingencies and litigation.  Actual results could differ from those estimates.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| Classification of Taxes Collected from Customers                                    | Classification of Taxes Collected from CustomersWe report sales, use, excise, and value added taxes assessed by a governmental authority that is directly imposed on a revenue-producing transaction between us and a customer on a net basis in our Consolidated Statements of Operations.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| Reclassifications                                                                   | ReclassificationsReclassifications have been made to the 2014 financial statements to make them comparable with the 2015 presentation.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |

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Disclosure of accounting policy for determining the allowance for doubtful accounts for trade and other accounts receivable balances, and when impairments, charge-offs or recoveries are recognized.
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| - Definition
Disclosure of accounting policy for recognizing revenue from a transaction on a gross or net basis.
+ References
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| - Definition
Disclosure of accounting policy for revenue recognition. If the entity has different policies for different types of revenue transactions, the policy for each material type of transaction is generally disclosed. If a sales transaction has multiple element arrangements (for example, delivery of multiple products, services or the rights to use assets) the disclosure may indicate the accounting policy for each unit of accounting as well as how units of accounting are determined and valued. The disclosure may encompass important judgment as to appropriateness of principles related to recognition of revenue. The disclosure also may indicate the entity's treatment of any unearned or deferred revenue that arises from the transaction.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Disclosure of accounting policy for the use of estimates in the preparation of financial statements in conformity with generally accepted accounting principles.
+ References
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