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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]
$ / shares in Units, $ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
Transactions
$ / shares
Dec. 31, 2017
USD ($)
Transactions
$ / shares
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Derivative, Number of Instruments Held | Transactions 2 2
Other investments $ 394,396 $ 431,630
Other [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Notional outstanding $ 311,237 $ 325,890
Weighted average reference obligation price | $ / shares $ 98.1 $ 99.3
Weighted average life (WAL) in years 6 years 1 month 6 years 6 months
Weighted average credit rating A A
Weighted average relative change ratio 23.40% 23.60%
CVA percentage 8.06% 9.64%
Fair value of derivative liabilities $ 1,326 $ 566
Real Estate [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Other investments 33,297 33,154
Hedge Funds, Multi-strategy [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Other investments 31,417 53,054
Interest Rate Contract [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Other investments 145,981 136,603
Illiquid Investments [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Other investments $ 67,214 $ 67,787
Asset-backed Securities [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs Coupon Rate 5.97% 5.97%
Fair Value Inputs Maturity 16 years 7 months 24 days 17 years 9 days
Fair Value Inputs Yield 0.00% 12.00%
Variable Interest Entity, Primary Beneficiary [Member] | European Transactions [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs Coupon Rate 0.36% 0.40%
Fair Value Inputs Maturity 14 years 9 months 20 days 15 years 3 months 11 days
Fair Value Inputs Yield 5.84% 4.82%