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Fair Value Measurements - Information about Valuation Inputs for Fixed Income Securities Classified as Level 3 (Detail) - Successor [Member] - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Available-for-sale Securities $ 6,186,101 $ 5,334,120
Asset-backed Securities [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Coupon rate 5.96%  
Fair Value Inputs Maturity 17 years 11 months 5 days  
Yield 12.00%  
Variable Interest Entity, Primary Beneficiary [Member] | United States Transactions [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Coupon rate 5.88% 5.88%
Fair Value Inputs Maturity 21 years 1 month 5 days 21 years 9 months 23 days
Yield 5.90% 9.14%
Fair Value, Inputs, Level 3 [Member] | Corporate Obligations [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Available-for-sale Securities $ 0 $ 0
Fair Value, Inputs, Level 3 [Member] | Asset-backed Securities [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Available-for-sale Securities 72,899 0
Fair Value, Inputs, Level 3 [Member] | Variable Interest Entity, Primary Beneficiary [Member] | Corporate Obligations [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Available-for-sale Securities $ 2,828,685 $ 2,588,556