| **CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)In Thousands, unless otherwise specified**    | 3 Months Ended                                                                  |
|----------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------|
||
| **Cash flows from operating activities:**                                                    |                                                                            |   |
| Net income (loss)                                                                            | $ (18,725)us-gaap_ProfitLoss                                                    | $ 10,761us-gaap_ProfitLoss |
| **Adjustments to reconcile net income (loss) to net cash provided by operating activities:** |                                                                            |   |
| Depreciation and amortization expense                                                        | 45,235us-gaap_DepreciationDepletionAndAmortization                              | 42,352us-gaap_DepreciationDepletionAndAmortization |
| Software impairment charge                                                                   | 26,417us-gaap_NoncashProjectAbandonmentCosts                                    | 0us-gaap_NoncashProjectAbandonmentCosts |
| Deferred income tax expense (benefit)                                                        | (6,786)us-gaap_DeferredIncomeTaxExpenseBenefit                                  | 1,196us-gaap_DeferredIncomeTaxExpenseBenefit |
| Share-based compensation expense                                                             | 2,801us-gaap_ShareBasedCompensation                                             | 1,778us-gaap_ShareBasedCompensation |
| Other noncash income and expense items                                                       | 6,938us-gaap_OtherNoncashIncomeExpense                                          | 1,664us-gaap_OtherNoncashIncomeExpense |
| Change in operating assets and liabilities                                                   | 18,837us-gaap_IncreaseDecreaseInOperatingCapital                                | 7,151us-gaap_IncreaseDecreaseInOperatingCapital |
| Net cash provided by operating activities                                                    | 74,717us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations    | 64,902us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations |
| **Cash flows from investing activities:**                                                    |                                                                            |   |
| Purchase of AWN non-controlling interest and ACS wireless assets                             | (285,392)us-gaap_PaymentsToAcquireBusinessesGross                               | 0us-gaap_PaymentsToAcquireBusinessesGross |
| Purchases of property and equipment                                                          | (49,332)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment                      | (28,174)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment |
| Grant proceeds                                                                               | 14,007gncma_GrantProceeds                                                       | 716gncma_GrantProceeds |
| Note receivable issued to an equity method investee                                          | (3,000)us-gaap_PaymentsForAdvanceToAffiliate                                    | 0us-gaap_PaymentsForAdvanceToAffiliate |
| Purchases of other assets and intangible assets                                              | (2,808)us-gaap_PaymentsToAcquireOtherProductiveAssets                           | (1,463)us-gaap_PaymentsToAcquireOtherProductiveAssets |
| Purchase of investments                                                                      | 0us-gaap_PaymentsToAcquireEquityMethodInvestments                               | (15,000)us-gaap_PaymentsToAcquireEquityMethodInvestments |
| Restricted cash                                                                              | 10us-gaap_IncreaseDecreaseInRestrictedCash                                      | 2,672us-gaap_IncreaseDecreaseInRestrictedCash |
| Other                                                                                        | (2,167)us-gaap_PaymentsForProceedsFromOtherInvestingActivities                  | 49us-gaap_PaymentsForProceedsFromOtherInvestingActivities |
| Net cash used for investing activities                                                       | (328,682)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations | (41,200)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations |
| **Cash flows from financing activities:**                                                    |                                                                            |   |
| Borrowing on Amended Senior Credit Facility                                                  | 295,000us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt                         | 0us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt |
| Issuance of Searchlight note payable and derivative stock appreciation rights                | 75,000us-gaap_ProceedsFromIssuanceOfUnsecuredDebt                               | 0us-gaap_ProceedsFromIssuanceOfUnsecuredDebt |
| Repayment of debt and capital lease obligations                                              | (61,350)us-gaap_RepaymentsOfLongTermDebtAndCapitalSecurities                    | (2,185)us-gaap_RepaymentsOfLongTermDebtAndCapitalSecurities |
| Purchase of treasury stock to be retired                                                     | (16,993)us-gaap_PaymentsForRepurchaseOfCommonStock                              | (529)us-gaap_PaymentsForRepurchaseOfCommonStock |
| Payment of debt issuance costs                                                               | (5,853)us-gaap_PaymentsOfDebtIssuanceCosts                                      | 0us-gaap_PaymentsOfDebtIssuanceCosts |
| Distribution to non-controlling interest                                                     | (4,932)us-gaap_PaymentsToMinorityShareholders                                   | (12,500)us-gaap_PaymentsToMinorityShareholders |
| Proceeds from stock option exercises                                                         | 295us-gaap_ProceedsFromStockOptionsExercised                                    | 157us-gaap_ProceedsFromStockOptionsExercised |
| Borrowing on other long-term debt                                                            | 203us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt                              | 0us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt |
| Net cash (used for) provided by financing activities                                         | 281,370us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations   | (15,057)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations |
| Net increase in cash and cash equivalents                                                    | 27,405us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease                      | 8,645us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease |
| Cash and cash equivalents at beginning of period                                             | 15,402us-gaap_CashAndCashEquivalentsAtCarryingValue                             | 44,971us-gaap_CashAndCashEquivalentsAtCarryingValue |
| Cash and cash equivalents at end of period                                                   | $ 42,807us-gaap_CashAndCashEquivalentsAtCarryingValue                           | $ 53,616us-gaap_CashAndCashEquivalentsAtCarryingValue |

| X                                                                                                                                                                                                                                                                                                                                                                                                                            |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Proceeds received during the period awarded to an entity to carry out a specific purpose as provided in grant agreements. Proceeds are repayable if certain conditions as outlined in the grant agreement are not met.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.
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| - Definition
The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.
+ References
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| - Definition
The increase (decrease) during the reporting period of all assets and liabilities used in operating activities.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The net cash inflow or outflow for the increase (decrease) associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as investing activities.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of cash inflow (outflow) of financing activities, excluding discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of cash inflow (outflow) of investing activities, excluding discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of cash inflow (outflow) from operating activities, excluding discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.
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| - Definition
The expense charged against earnings to eliminate the capitalized costs of projects that have been terminated during the reporting period, which is added back to net income when calculating cash provided by (used in) operations using the indirect method.
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| - Definition
Other income (expense) included in net income that results in no cash inflows or outflows in the period. Includes noncash adjustments to reconcile net income (loss) to cash provided by (used in) operating activities that are not separately disclosed.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash outflow from advancing money to an affiliate (an entity that is related but not strictly controlled by the entity).
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.
+ References
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| - Definition
The cash outflow to reacquire common stock during the period.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.
+ References
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| - Definition
The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash outflow for acquisition of or capital improvements on other tangible or intangible assets not otherwise defined in the taxonomy.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of cash outflow to a noncontrolling interest. Includes, but not limited to, reduction of noncontrolling interest ownership. Excludes dividends paid to the noncontrolling interest.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash inflow from other long-term borrowings not otherwise defined in the taxonomy (with maturities initially due beyond one year or the normal operating cycle of the entity, if longer).
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer).
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash inflow from the issuance of long-term debt that is not secured by collateral. Excludes proceeds from tax exempt unsecured debt.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash outflow associated with security instruments that either represent a creditor or an ownership relationship with the holder of the investment security with a maturity of beyond one year or normal operating cycle, if longer.  Includes repayments of (a) debt, (b) capital lease obligations, (c) mandatory redeemable capital securities, and (d) any combination of (a), (b), or (c).
+ References
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| - Definition
The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.
+ References
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