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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) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Notional outstanding	$ 1,529,759invest_DerivativeNotionalAmount	$ 2,776,103invest_DerivativeNotionalAmount
Successor [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Notional outstanding	1,529,759	2,776,103
Successor [Member] \| CLO [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Notional outstanding	549,923	1,337,737
Weighted average reference obligation price	$ 98.9	$ 98.0
Weighted average life (WAL) in years	1 year 9 months	2 years 1 month 6 days
Weighted average credit rating	AA	AA
Weighted average relative change ratio	35.90%	35.30%
CVA percentage	5.40%	13.67%
Fair value of derivative liabilities	2,027	7,993
Successor [Member] \| Other [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Notional outstanding	921,036	1,291,371
Weighted average reference obligation price	$ 86.8	$ 85.7
Weighted average life (WAL) in years	5 years 8 months	5 years 4 months 24 days
Weighted average credit rating	BBB-	BBB-
Weighted average relative change ratio	49.00%	43.10%
CVA percentage	15.82%	30.70%
Fair value of derivative liabilities	$ 71,104	$ 84,780

Fair value, after offset of derivative asset, of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be and before offset against a right to receive collateral under a master netting arrangement. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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