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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
 6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Available-for-sale Securities $ 6,110,754 $ 5,334,120
Asset-backed Securities [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Coupon rate 5.96%  
Fair Value Inputs Maturity 18 years 1 month 10 days  
Yield 12.25%  
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 4 months 5 days 21 years 9 months 23 days
Yield 7.05% 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 71,820 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 $ 2,577,293 $ 2,588,556