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Subsequent Event (Details) (Subsequent event, USD $)
In Thousands, unless otherwise specified
 0 Months Ended
Jan. 01, 2015
plan
plan_participant
Feb. 05, 2015
Subsequent event    
Dividends payable   $ 76,801us-gaap_DividendsPayableCurrentAndNoncurrent
Putnam    
Subsequent event    
Number of Acquired Business' Plans 433gac_BusinessAcquisitionNumberofPlansofAcquiredBusiness
/ us-gaap_BusinessAcquisitionAxis
= gac_PutnamMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		  
Number of acquired business' plan participants 230,000us-gaap_DefinedContributionPlanNumberOfEmployeesCovered
/ us-gaap_BusinessAcquisitionAxis
= gac_PutnamMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		  
Acquired business' assets under management $ 17,545,000gac_BusinessAcquisitionAcquiredBusinessAssetsUnderAdministration
/ us-gaap_BusinessAcquisitionAxis
= gac_PutnamMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember