| **Consolidated Statements of Income (USD $)In Thousands, unless otherwise specified**    | 12 Months Ended                                                                                                                 |
|------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------|
||
| **Revenues**                                                                             |                                                                                                                            |   |   |
| Premium income                                                                           | $ 446,395us-gaap_PremiumsEarnedNet                                                                                              | $ 464,093us-gaap_PremiumsEarnedNet | $ 422,153us-gaap_PremiumsEarnedNet |
| Fee income                                                                               | 729,179us-gaap_InsuranceCommissionsAndFees                                                                                      | 618,244us-gaap_InsuranceCommissionsAndFees | 535,823us-gaap_InsuranceCommissionsAndFees |
| Other revenue                                                                            | 7,506us-gaap_OtherIncome                                                                                                        | 7,355us-gaap_OtherIncome | 0us-gaap_OtherIncome |
| Net investment income                                                                    | 1,228,388us-gaap_NetInvestmentIncome                                                                                            | 1,091,389us-gaap_NetInvestmentIncome | 1,191,551us-gaap_NetInvestmentIncome |
| **Realized investment gains (losses), net:**                                             |                                                                                                                            |   |   |
| Total other-than-temporary losses                                                        | (4,334)us-gaap_ImpairmentOfInvestments                                                                                          | (372)us-gaap_ImpairmentOfInvestments | (5,138)us-gaap_ImpairmentOfInvestments |
| Other-than-temporary (gains) losses transferred to other comprehensive income            | 0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent | (434)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent | (61)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent |
| Other realized investment gains (losses), net                                            | 151,705gac_RealizedInvestmentsGainsLossesOther                                                                                  | (13,330)gac_RealizedInvestmentsGainsLossesOther | 121,916gac_RealizedInvestmentsGainsLossesOther |
| Total realized investment gains (losses), net                                            | 147,371us-gaap_RealizedInvestmentGainsLosses                                                                                    | (14,136)us-gaap_RealizedInvestmentGainsLosses | 116,717us-gaap_RealizedInvestmentGainsLosses |
| Total revenues                                                                           | 2,558,839us-gaap_Revenues                                                                                                       | 2,166,945us-gaap_Revenues | 2,266,244us-gaap_Revenues |
| **Benefits and expenses:**                                                               |                                                                                                                            |   |   |
| Life and other policy benefits                                                           | 643,420us-gaap_PolicyholderBenefitsAndClaimsIncurredNet                                                                         | 650,584us-gaap_PolicyholderBenefitsAndClaimsIncurredNet | 682,088us-gaap_PolicyholderBenefitsAndClaimsIncurredNet |
| (Decrease) increase in future policy benefits                                            | (56,073)us-gaap_LiabilityForFuturePolicyBenefitsPeriodExpense                                                                   | 5,575us-gaap_LiabilityForFuturePolicyBenefitsPeriodExpense | (66,697)us-gaap_LiabilityForFuturePolicyBenefitsPeriodExpense |
| Interest paid or credited to contractholders                                             | 575,400us-gaap_InterestCreditedToPolicyholdersAccountBalances                                                                   | 505,698us-gaap_InterestCreditedToPolicyholdersAccountBalances | 519,499us-gaap_InterestCreditedToPolicyholdersAccountBalances |
| Provision for policyholders’ share of (losses) earnings on participating business | (1,041)gac_ProvisionBenefitforPolicyholdersShareofEarningsonParticipatingBusinessIncludingNonrecurringCharges                   | 3,976gac_ProvisionBenefitforPolicyholdersShareofEarningsonParticipatingBusinessIncludingNonrecurringCharges | (580)gac_ProvisionBenefitforPolicyholdersShareofEarningsonParticipatingBusinessIncludingNonrecurringCharges |
| Dividends to policyholders                                                               | 60,739us-gaap_PolicyholderDividends                                                                                             | 66,258us-gaap_PolicyholderDividends | 64,000us-gaap_PolicyholderDividends |
| Total benefits                                                                           | 1,222,445gac_BenefitsExpenses                                                                                                   | 1,232,091gac_BenefitsExpenses | 1,198,310gac_BenefitsExpenses |
| General insurance expenses                                                               | 780,991us-gaap_SellingGeneralAndAdministrativeExpense                                                                           | 650,347us-gaap_SellingGeneralAndAdministrativeExpense | 596,649us-gaap_SellingGeneralAndAdministrativeExpense |
| Amortization of DAC and VOBA                                                             | 44,845us-gaap_AmortizationOfCapitalizedValueOfBusinessAcquiredAsset                                                             | 59,645us-gaap_AmortizationOfCapitalizedValueOfBusinessAcquiredAsset | 60,479us-gaap_AmortizationOfCapitalizedValueOfBusinessAcquiredAsset |
| Interest expense                                                                         | 37,286us-gaap_InterestExpense                                                                                                   | 37,329us-gaap_InterestExpense | 37,387us-gaap_InterestExpense |
| Total benefits and expenses                                                              | 2,085,567us-gaap_BenefitsLossesAndExpenses                                                                                      | 1,979,412us-gaap_BenefitsLossesAndExpenses | 1,892,825us-gaap_BenefitsLossesAndExpenses |
| Income (loss) before income taxes                                                        | 473,272us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments      | 187,533us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 373,419us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |
| Income tax expense                                                                       | 155,903us-gaap_IncomeTaxExpenseBenefit                                                                                          | 58,791us-gaap_IncomeTaxExpenseBenefit | 135,305us-gaap_IncomeTaxExpenseBenefit |
| Net income (loss)                                                                        | $ 317,369us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic                                                                | $ 128,742us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 238,114us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The total amount of expense recognized during the period for future policy benefits, claims and claims adjustment costs, which also includes interest to contract holders, dividends to policyholders and provision (benefit) for policyholders' share of earnings in the participating business during the period.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Provision Benefit for Policyholders' Share of Earnings on Participating Business, Including Nonrecurring Charges
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                        |
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| - Definition
The net gain (loss) resulting from the sale or disposal of other investments during the period.
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No definition available.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Represents total amortization expense with respect to capitalized value of business asset acquired (present value of future profits) reflected in the income statement for the period, generally on the same basis for amortization of deferred policy acquisition costs.
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| - Definition
The total amount of expense recognized during the period for future policy benefits, claims and claims adjustment costs, and for selling, general and administrative costs.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.
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| - Definition
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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| - Definition
Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.
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| - Definition
Income from agency and brokerage operations (includes sales of annuities and supplemental contracts); service charges, commissions, and fees from the sale of insurance and related services; and management fees from separate accounts, deferred annuities, and universal life products.
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| - Definition
Interest allocated to policyholders holding contracts under which the insurer must provide a guaranteed yield.
+ References
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| - Definition
Amount of the cost of borrowed funds accounted for as interest expense.
+ References
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| - Definition
Amount of expense (income) recognized due to changes in the accrued obligation to policyholders that relates to insured events.
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| - Definition
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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| - Definition
Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.
+ References
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| - Definition
Reflects the sum of all other revenue and income recognized by the entity in the period not otherwise specified in the income statement.
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| - Definition
Amount before tax of other than temporary impairment loss (OTTI) on investments in available-for-sale and held-to-maturity debt securities, recognized in other comprehensive loss and attributable to parent entity.
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| - Definition
Amount, after effects of policies assumed or ceded, of expense related to the provision for policy benefits and costs incurred.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of expense for dividends to policyholders.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.
+ References
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| - Definition
Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).
+ 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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