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Summary of Quantitative Inputs and Assumptions of Level 3 Assets and Liabilities (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items]      
Estimated Fair Value $ 52,532 $ 57,381  
Future policy benefits (embedded derivatives), fair value $ 48,395 $ 55,143  
Own credit risk 0.45% 0.50%  
Long-term volatility 25.00%    
Long-term volatility 30.00%    
Fixed maturity AFS securities      
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items]      
Estimated Fair Value [1] $ 13,288 $ 9,215 $ 6,666
Fixed maturity AFS securities | Asset-backed securities      
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items]      
Estimated Fair Value $ 13,288 $ 9,215  
Fixed maturity AFS securities | Asset-backed securities | Level 3      
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items]      
Valuation Technique Broker Broker  
GMIB      
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items]      
Estimated Fair Value [2] $ 39,244 $ 48,166 61,426
GMIB | Level 3      
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items]      
Valuation Technique Discounted cash flows Discounted cash flows  
GMIB | Level 3 | Weighted Average      
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items]      
Own credit risk 45.00% 50.00%  
Long-term volatility 25.00% 25.00%  
Long-term volatility 30.00% 30.00%  
GMWB      
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items]      
Future policy benefits (embedded derivatives), fair value [2] $ 47,666 $ 54,414 60,618
GMWB | Level 3      
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items]      
Valuation Technique Discounted cash flows Discounted cash flows  
GMWB | Level 3 | Weighted Average      
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items]      
Own credit risk 45.00% 50.00%  
Long-term volatility 25.00% 25.00%  
Long-term volatility 30.00% 30.00%  
SALB      
Fair Value Inputs Assets And Liabilities Quantitative Information [Line Items]      
Future policy benefits (embedded derivatives), fair value [2] $ 729 $ 729 $ 511
[1] Recorded as a component of fixed maturity AFS securities on the Balance Sheets.
[2] GMWB and SALB are recorded as a component of future policy benefits on the Balance Sheets and GMIB reinsurance is recorded as recoverable of ceded GMIB embedded derivatives, at fair value on the Balance Sheets.