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Summary of Variable Annuity Contracts Containing GMIB and GMDB Provisions Reinsured With Life Insurance in Force (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Life insurance    
Effects Of Reinsurance [Line Items]    
Gross amount $ 4,415,816 $ 4,465,980
Ceded to other companies 139,449 143,356
Assumed from other companies 1,108 1,047
Net amount $ 4,277,475 $ 4,323,671
Percentage of amount assumed to net amount 0.03% 0.02%
Percentage of amount ceded to gross amount 3.16% 3.21%
GMIB    
Effects Of Reinsurance [Line Items]    
Gross amount $ 1,396,427 $ 1,453,202
Ceded to other companies 456,695 478,098
Net amount $ 939,732 $ 975,104
Percentage of amount assumed to net amount 0.00% 0.00%
Percentage of amount ceded to gross amount 32.70% 32.90%
GMDB    
Effects Of Reinsurance [Line Items]    
Gross amount $ 3,825,029 $ 3,979,129
Ceded to other companies 163,040 171,818
Net amount $ 3,661,990 $ 3,807,311
Percentage of amount assumed to net amount 0.00% 0.00%
Percentage of amount ceded to gross amount 4.26% 4.32%