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Derivative Instruments - Summarize Information by Major Category of CDS Contracts (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 Transactions	Dec. 31, 2011 Transactions
Summary of information by major category of CDS contracts
Number of CDS transactions	51	68
Remaining expected weighted-average life of obligations (in years)	3 years 7 months 6 days	4 years 1 month 6 days
Gross principal notional outstanding	$ 11,281,777	$ 14,166,612
Net derivative liabilities at fair value	(62,854)
Credit derivatives [Member]
Summary of information by major category of CDS contracts
Net derivative liabilities at fair value	(213,585)	(190,653)
CLO [Member]
Summary of information by major category of CDS contracts
Number of CDS transactions	30	44
Remaining expected weighted-average life of obligations (in years)	2 years 2 months 12 days	2 years 8 months 12 days
Gross principal notional outstanding	6,155,767	8,228,577
CLO [Member] \| Credit derivatives [Member]
Summary of information by major category of CDS contracts
Net derivative liabilities at fair value	(34,645)	(54,320)
Other [Member]
Summary of information by major category of CDS contracts
Number of CDS transactions	21	24
Remaining expected weighted-average life of obligations (in years)	5 years 2 months 12 days	6 years
Gross principal notional outstanding	5,126,010	5,938,035
Other [Member] \| Credit derivatives [Member]
Summary of information by major category of CDS contracts
Net derivative liabilities at fair value	$ (178,940)	$ (136,333)