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Fair Value Measurements - Summary of Information about Described Model Inputs Used to Determine Fair Value of Each Class of Credit Derivatives (Detail) - Successor [Member] - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Other investments $ 478,688 $ 450,307
Notional outstanding 722,492 737,380
Other [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Notional outstanding $ 722,492 $ 737,380
Weighted average reference obligation price $ 93.8 $ 93.5
Weighted average life (WAL) in years 5 years 1 month 5 years 2 months
Weighted average credit rating A- A-
Weighted average relative change ratio 31.50% 31.60%
CVA percentage 11.10% 11.14%
Fair value of derivative liabilities $ 14,496 $ 15,349
Real Estate [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Other investments 31,518 33,303
Hedge Funds, Multi-strategy [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Other investments 48,283 53,985
Interest Rate Contract [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Other investments 278,166 261,315
Illiquid Investments [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Other investments $ 40,814 $ 39,068
Asset-backed Securities [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs Coupon Rate 5.97% 5.93%
Fair Value Inputs Maturity 17 years 6 months 22 days 17 years 8 months 25 days
Fair Value Inputs Yield 0.00% 13.50%
Variable Interest Entity, Primary Beneficiary [Member] | US Commercial ABS Transaction [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs Coupon Rate 5.88% 5.88%
Fair Value Inputs Maturity 20 years 7 months 5 days 20 years 8 months 68 days
Fair Value Inputs Yield 5.95% 5.86%
Variable Interest Entity, Primary Beneficiary [Member] | European Transactions [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs Coupon Rate 0.43% 0.46%
Fair Value Inputs Maturity 16 years 20 days 16 years 1 month 28 days
Fair Value Inputs Yield 4.96% 4.95%