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Summary of Variable Annuity Contracts Containing GMIB and GMDB Provisions Reinsured With Life Insurance in Force (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Life insurance    
Effects of Reinsurance [Line Items]    
Gross amount $ 4,465,980 $ 4,586,845
Ceded to other companies 143,356 160,455
Assumed from other companies 1,047 924
Net amount $ 4,323,671 $ 4,427,314
Percentage of amount assumed to net 0.02% 0.02%
Percentage of amount ceded to gross amount 3.21% 3.50%
GMIB    
Effects of Reinsurance [Line Items]    
Gross amount $ 1,453,202 $ 1,430,611
Ceded to other companies 478,098 480,283
Net amount $ 975,104 $ 950,328
Percentage of amount assumed to net 0.00% 0.00%
Percentage of amount ceded to gross amount 32.90% 33.57%
GMDB    
Effects of Reinsurance [Line Items]    
Gross amount $ 3,979,129 $ 3,947,838
Ceded to other companies 171,818 168,608
Net amount $ 3,807,311 $ 3,779,230
Percentage of amount assumed to net 0.00% 0.00%
Percentage of amount ceded to gross amount 4.32% 4.27%