| **CONSOLIDATED INCOME STATEMENTS (USD $)In Thousands, except Per Share data, unless otherwise specified**           | 12 Months Ended                                                                                                             |
|---------------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------|
||
| **Revenues:**                                                                                                       |                                                                                                                        |   |   |
| Non-related party                                                                                                   | $ 850,656gncma_TradeRevenue                                                                                                 | $ 782,971gncma_TradeRevenue | $ 710,181gncma_TradeRevenue |
| Related party                                                                                                       | 59,542us-gaap_RevenueFromRelatedParties                                                                                     | 28,677us-gaap_RevenueFromRelatedParties | 0us-gaap_RevenueFromRelatedParties |
| Total revenues                                                                                                      | 910,198us-gaap_SalesRevenueNet                                                                                              | 811,648us-gaap_SalesRevenueNet | 710,181us-gaap_SalesRevenueNet |
| **Cost of goods sold (exclusive of depreciation and amortization shown separately below):**                         |                                                                                                                        |   |   |
| Non-related party                                                                                                   | 291,770gncma_CostandExpensesTrade                                                                                           | 275,701gncma_CostandExpensesTrade | 247,501gncma_CostandExpensesTrade |
| Related party                                                                                                       | 10,934us-gaap_CostsAndExpensesRelatedParty                                                                                  | 4,761us-gaap_CostsAndExpensesRelatedParty | 0us-gaap_CostsAndExpensesRelatedParty |
| Total cost of goods sold                                                                                            | 302,704us-gaap_CostOfGoodsSoldExcludingDepreciationDepletionAndAmortization                                                 | 280,462us-gaap_CostOfGoodsSoldExcludingDepreciationDepletionAndAmortization | 247,501us-gaap_CostOfGoodsSoldExcludingDepreciationDepletionAndAmortization |
| **Selling, General and Administrative Expense [Abstract]**                                                          |                                                                                                                        |   |   |
| Non-related party                                                                                                   | 289,674gncma_SellingGeneralandAdministrativeExpenseTrade                                                                    | 268,026gncma_SellingGeneralandAdministrativeExpenseTrade | 241,079gncma_SellingGeneralandAdministrativeExpenseTrade |
| Related party                                                                                                       | 3,973gncma_SellingGeneralandAdministrativeExpenseRelatedParty                                                               | 3,039gncma_SellingGeneralandAdministrativeExpenseRelatedParty | 2,169gncma_SellingGeneralandAdministrativeExpenseRelatedParty |
| Total selling, general and administrative expenses                                                                  | 293,647us-gaap_SellingGeneralAndAdministrativeExpense                                                                       | 271,065us-gaap_SellingGeneralAndAdministrativeExpense | 243,248us-gaap_SellingGeneralAndAdministrativeExpense |
| Depreciation and amortization expense                                                                               | 170,285us-gaap_DepreciationDepletionAndAmortization                                                                         | 147,259us-gaap_DepreciationDepletionAndAmortization | 130,452us-gaap_DepreciationDepletionAndAmortization |
| Operating income                                                                                                    | 143,562us-gaap_OperatingIncomeLoss                                                                                          | 112,862us-gaap_OperatingIncomeLoss | 88,980us-gaap_OperatingIncomeLoss |
| **Other income (expense):**                                                                                         |                                                                                                                        |   |   |
| Interest expense (including amortization of deferred loan fees)                                                     | (72,496)us-gaap_InterestExpense                                                                                             | (69,725)us-gaap_InterestExpense | (67,747)us-gaap_InterestExpense |
| Other                                                                                                               | (1,793)us-gaap_OtherNonoperatingIncomeExpense                                                                               | (453)us-gaap_OtherNonoperatingIncomeExpense | 17us-gaap_OtherNonoperatingIncomeExpense |
| Other expense, net                                                                                                  | (74,289)us-gaap_NonoperatingIncomeExpense                                                                                   | (70,178)us-gaap_NonoperatingIncomeExpense | (67,730)us-gaap_NonoperatingIncomeExpense |
| Income before income tax expense                                                                                    | 69,273us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments   | 42,684us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 21,250us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |
| Income tax expense                                                                                                  | (10,029)us-gaap_IncomeTaxExpenseBenefit                                                                                     | (10,957)us-gaap_IncomeTaxExpenseBenefit | (12,088)us-gaap_IncomeTaxExpenseBenefit |
| Net income                                                                                                          | 59,244us-gaap_ProfitLoss                                                                                                    | 31,727us-gaap_ProfitLoss | 9,162us-gaap_ProfitLoss |
| Net income (loss) attributable to non-controlling interests                                                         | 51,687us-gaap_NetIncomeLossAttributableToNoncontrollingInterest                                                             | 22,321us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (511)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest |
| Net income attributable to General Communication, Inc.                                                              | 7,557us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic                                                                | 9,406us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 9,673us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |
| Class A Common Stock                                                                                                |                                                                                                                        |   |   |
| **Other income (expense):**                                                                                         |                                                                                                                        |   |   |
| Net income attributable to General Communication, Inc.                                                              | 6,980us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic/ us-gaap_StatementClassOfStockAxis= us-gaap_CommonClassAMember | 8,678us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic/ us-gaap_StatementClassOfStockAxis= us-gaap_CommonClassAMember | 8,938us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic/ us-gaap_StatementClassOfStockAxis= us-gaap_CommonClassAMember |
| **Earnings Per Share [Abstract]**                                                                                   |                                                                                                                        |   |   |
| Basic net income attributable to General Communication, Inc. common stockholders per common share (USD per share)   | $ 0.18us-gaap_EarningsPerShareBasic/ us-gaap_StatementClassOfStockAxis= us-gaap_CommonClassAMember                          | $ 0.23us-gaap_EarningsPerShareBasic/ us-gaap_StatementClassOfStockAxis= us-gaap_CommonClassAMember | $ 0.23us-gaap_EarningsPerShareBasic/ us-gaap_StatementClassOfStockAxis= us-gaap_CommonClassAMember |
| Diluted net income attributable to General Communication, Inc. common stockholders per common share (USD per share) | $ 0.18us-gaap_EarningsPerShareDiluted/ us-gaap_StatementClassOfStockAxis= us-gaap_CommonClassAMember                        | $ 0.23us-gaap_EarningsPerShareDiluted/ us-gaap_StatementClassOfStockAxis= us-gaap_CommonClassAMember | $ 0.23us-gaap_EarningsPerShareDiluted/ us-gaap_StatementClassOfStockAxis= us-gaap_CommonClassAMember |
| Class B Common Stock                                                                                                |                                                                                                                        |   |   |
| **Other income (expense):**                                                                                         |                                                                                                                        |   |   |
| Net income attributable to General Communication, Inc.                                                              | $ 577us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic/ us-gaap_StatementClassOfStockAxis= us-gaap_CommonClassBMember | $ 728us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic/ us-gaap_StatementClassOfStockAxis= us-gaap_CommonClassBMember | $ 735us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic/ us-gaap_StatementClassOfStockAxis= us-gaap_CommonClassBMember |
| **Earnings Per Share [Abstract]**                                                                                   |                                                                                                                        |   |   |
| Basic net income attributable to General Communication, Inc. common stockholders per common share (USD per share)   | $ 0.18us-gaap_EarningsPerShareBasic/ us-gaap_StatementClassOfStockAxis= us-gaap_CommonClassBMember                          | $ 0.23us-gaap_EarningsPerShareBasic/ us-gaap_StatementClassOfStockAxis= us-gaap_CommonClassBMember | $ 0.23us-gaap_EarningsPerShareBasic/ us-gaap_StatementClassOfStockAxis= us-gaap_CommonClassBMember |
| Diluted net income attributable to General Communication, Inc. common stockholders per common share (USD per share) | $ 0.18us-gaap_EarningsPerShareDiluted/ us-gaap_StatementClassOfStockAxis= us-gaap_CommonClassBMember                        | $ 0.23us-gaap_EarningsPerShareDiluted/ us-gaap_StatementClassOfStockAxis= us-gaap_CommonClassBMember | $ 0.23us-gaap_EarningsPerShareDiluted/ us-gaap_StatementClassOfStockAxis= us-gaap_CommonClassBMember |

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The aggregate cost of goods produced and sold during the reporting period, excluding depreciation, depletion, and amortization.
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Costs of sales and operating expenses for the period incurred from transactions with related parties.
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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.
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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.
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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.
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Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.
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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.
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Amount of the cost of borrowed funds accounted for as interest expense.
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Amount of Net Income (Loss) attributable to noncontrolling interest.
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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).
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The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business).
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The net result for the period of deducting operating expenses from operating revenues.
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The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, and (f) miscellaneous other income and expense items.
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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.
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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.
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| - Definition
Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.
+ References
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| - Definition
The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.
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