| **Business and Summary of Significant Accounting Principles (Policies)** | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
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| **Accounting Policies [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 own a two-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”).  TIF became a VIE on August 30, 2011.  TIF 2 and TIF 2-USB became VIEs on October 3, 2012.  TIF 3 became a VIE on December 11, 2012.  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 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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| Acquisition                                                              | We accounted for the acquisition of AWN using the acquisition method of accounting for business combinations with GCI treated as the acquiring entity.  Accordingly, the assets and liabilities contributed from ACS were recorded at estimated fair values as of the date of acquisition.  We used a combination of the discounted cash flows and market method to value the wireless licenses.  We used the cost approach to value the acquired fixed assets and right-to-use assets.  We used a discounted cash flow method to determine the fair value of the non-controlling interest.  The assets and liabilities contributed to AWN by GCI were measured at their carrying amount immediately prior to the contribution as GCI is maintaining control over the assets and liabilities.We have not completed our analysis of the valuation, therefore, the amounts recorded and classifications used for the assets acquired and liabilities assumed are provisional and subject to change.  We will finalize the amounts recognized as we obtain the information necessary to complete our analysis.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
| Recently Adopted Accounting Pronouncements                               | Recently Adopted Accounting PronouncementsAccounting Standards Update (“ASU”) 2012-2, “Intangibles – Goodwill and Other (Topic 350): Testing Indefinite-Lived Intangible Assets for Impairment” allows an entity to assess qualitative factors (such as changes in management, key personnel, strategy, key technology or customers) to determine if it is more likely than not that an indefinite-lived intangible asset is impaired and thus whether it is necessary to perform the quantitative impairment test in accordance with GAAP.  The adoption of ASU 2012-2 on January 1, 2013 did not have a material impact on our income statements, financial position or cash flows.ASU 2012-4, “Technical Corrections and Improvements” includes amendments that cover a wide range of topics in the Accounting Standards Codification (“ASC”). These amendments include technical corrections and improvements to the ASC and conforming amendments related to fair value measurements.  The adoption of ASU 2012-4 on January 1, 2013 did not have a material impact on our income statements, financial position or cash flows                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| 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 per Common ShareWe compute net income attributable to GCI per share of Class A and Class B common stock using the “two class” method.  Therefore, basic net income per share is computed by dividing net income applicable to common stockholders by the weighted average number of common shares outstanding during the period.  Diluted net income per share is computed by dividing net income by the weighted average number of common and dilutive common equivalent shares outstanding during the period.  The computation of the dilutive net income 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 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.Undistributed earnings for each year are allocated based on the contractual participation rights of Class A and Class B common shares as if the earnings for the year had been distributed.  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. 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. |
| 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 and wireless licenses, our effective tax rate, purchase price allocations, deferred lease expense, asset retirement obligations, the accrual of cost of goods sold (exclusive of depreciation and amortization expense) (“Cost of Goods Sold”), depreciation 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 Income Statements                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |

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| - Definition
Disclosure of accounting policy for regulatory operations. May include descriptions of regulatory treatment for plant-based regulatory assets and other deferred charges could also be described.
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| - Definition
Disclosure of accounting policy for completed business combinations (purchase method, acquisition method or combination of entities under common control). This accounting policy may include a general discussion of the purchase method or acquisition method of accounting (including for example, the treatment accorded contingent consideration, the identification of assets and liabilities, the purchase price allocation process, how the fair values of acquired assets and liabilities are determined) and the entity's specific application thereof. An entity that acquires another entity in a leveraged buyout transaction generally discloses the accounting policy followed by the acquiring entity in determining the basis used to value its interest in the acquired entity, and the rationale for that accounting policy.
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| - Definition
Disclosure of accounting policy for subsidiaries or other investments that are consolidated, including the accounting treatment for intercompany accounts or transactions and any noncontrolling interest.
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| - Definition
Disclosure of accounting policy for consolidation to describe the significant judgments and assumptions made in determining whether a variable interest held by the entity requires the variable interest entity to be consolidated and (or) disclose information about its involvement with the variable interest entity; the methodology used by the entity for determining whether or not it is the primary beneficiary of the variable interest entity; and the significant factors considered and judgments made in determining that the power to direct the activities that significantly impact the economic performance of the variable interest entity are shared (as defined).
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Disclosure of accounting policy for computing basic and diluted earnings or loss per share for each class of common stock and participating security. Addresses all significant policy factors, including any antidilutive items that have been excluded from the computation and takes into account stock dividends, splits and reverse splits that occur after the balance sheet date of the latest reporting period but before the issuance of the financial statements.
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Disclosure of accounting policy pertaining to new accounting pronouncements that may impact the entity's financial reporting. Includes, but is not limited to, quantification of the expected or actual impact.
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Disclosure of accounting policy for recognizing revenue from a transaction on a gross or net basis.
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Disclosure of accounting policy for the use of estimates in the preparation of financial statements in conformity with generally accepted accounting principles.
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