Derivative Instruments - Summarize Information by Major Category of CDS Contracts (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) Transactions	Dec. 31, 2014 USD ($) Transactions
Summary of information by major category of CDS contracts
Gross principal notional outstanding	$ 970,883	$ 1,529,759
Successor [Member]
Summary of information by major category of CDS contracts
Number of CDS transactions | Transactions	14	16
Remaining expected weighted-average life of obligations (in years)	4 years 3 months	4 years 1 month 12 days
Gross principal notional outstanding	$ 970,883	$ 1,529,759
Successor [Member] | Credit Derivatives [Member]
Summary of information by major category of CDS contracts
Net derivative liabilities at fair value	$ 34,543	$ 73,459
CLO [Member] | Successor [Member]
Summary of information by major category of CDS contracts
Number of CDS transactions | Transactions	5	6
Remaining expected weighted-average life of obligations (in years)	1 year 1 month	1 year 9 months 18 days
Gross principal notional outstanding	$ 295,253	$ 549,923
CLO [Member] | Successor [Member] | Credit Derivatives [Member]
Summary of information by major category of CDS contracts
Net derivative liabilities at fair value	$ 1,837	$ 2,027
Other [Member] | Successor [Member]
Summary of information by major category of CDS contracts
Number of CDS transactions | Transactions	9	10
Remaining expected weighted-average life of obligations (in years)	5 years 7 months	5 years 5 months 2 days
Gross principal notional outstanding	$ 675,630	$ 979,836
Other [Member] | Successor [Member] | Credit Derivatives [Member]
Summary of information by major category of CDS contracts
Net derivative liabilities at fair value	$ 32,706	$ 71,432