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Derivative Instruments - Summarize Information by Major Category of CDS Contracts (Detail)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2016
USD ($)
Transactions
Dec. 31, 2015
USD ($)
Transactions
Summary of information by major category of CDS contracts    
Gross principal notional outstanding $ 820,988 $ 970,883
Successor [Member]    
Summary of information by major category of CDS contracts    
Number of CDS transactions | Transactions 8 14
Derivative, Average Remaining Maturity 5 years 4 years 3 months
Gross principal notional outstanding $ 820,988 $ 970,883
Successor [Member] | Credit Derivatives [Member]    
Summary of information by major category of CDS contracts    
Net derivative liabilities at fair value $ 16,700 $ 34,543
CLO [Member] | Successor [Member]    
Summary of information by major category of CDS contracts    
Number of CDS transactions | Transactions 3 5
Derivative, Average Remaining Maturity 8 months 1 year 1 month
Gross principal notional outstanding $ 176,384 $ 295,254
CLO [Member] | Successor [Member] | Credit Derivatives [Member]    
Summary of information by major category of CDS contracts    
Net derivative liabilities at fair value $ 399 $ 1,837
Other [Member] | Successor [Member]    
Summary of information by major category of CDS contracts    
Number of CDS transactions | Transactions 5 9
Derivative, Average Remaining Maturity 6 years 2 months 5 years 7 months
Gross principal notional outstanding $ 644,604 $ 675,629
Other [Member] | Successor [Member] | Credit Derivatives [Member]    
Summary of information by major category of CDS contracts    
Net derivative liabilities at fair value $ 16,301 $ 32,706