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Derivative Instruments - Summary of Location and Fair Values of Individual Derivative Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of derivative liabilities	$ (52,535)
Fair value of derivative liabilities	187,121	190,653
Consolidated Entity Excluding Variable Interest Entities VIE [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Derivative Asset Net, Fair Value	263,809	448,566
Fair value of derivative liabilities	621,932	687,867
Consolidated Entity Excluding Variable Interest Entities VIE [Member] | Total Derivatives Held For Trading [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Derivative Asset Net, Fair Value	263,809	442,511
Fair value of derivative liabilities	621,932	687,867
Variable Interest Entity [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Derivative Asset Net, Fair Value		27,779
Fair value of derivative liabilities	2,060,951	2,114,831
Derivatives Liability [Member] | Consolidated Entity Excluding Variable Interest Entities VIE [Member] | Total Derivatives Held For Trading [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Derivative Asset Fair Value, Gross Liability	166,345	30,859
Fair value of derivative liabilities	255
Derivatives Assets [Member] | Consolidated Entity Excluding Variable Interest Entities VIE [Member] | Total Derivatives Held For Trading [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Derivative Liabilities, Fair Value		242,500
Credit Derivatives [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of derivative liabilities	(187,121)	(190,653)
Credit Derivatives [Member] | Variable Interest Entity [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of derivative liabilities	20,747	20,934
Credit Derivatives [Member] | Derivatives Liability [Member] | Consolidated Entity Excluding Variable Interest Entities VIE [Member] | Total Derivatives Held For Trading [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of derivative liabilities	187,121	190,653
Interest Rate Swaps [Member] | Derivatives Liability [Member] | Consolidated Entity Excluding Variable Interest Entities VIE [Member] | Total Derivatives Held For Trading [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of derivative liabilities	432,581	251,303
Interest Rate Swaps [Member] | Derivatives Liability [Member] | Variable Interest Entity [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of derivative liabilities	1,981,460	2,023,974
Interest Rate Swaps [Member] | Derivatives Assets [Member] | Consolidated Entity Excluding Variable Interest Entities VIE [Member] | Total Derivatives Held For Trading [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Derivative Asset Net, Fair Value	97,464	411,652
Currency Swaps [Member] | Derivatives Liability [Member] | Consolidated Entity Excluding Variable Interest Entities VIE [Member] | Total Derivatives Held For Trading [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of derivative liabilities		2,423
Currency Swaps [Member] | Derivatives Liability [Member] | Variable Interest Entity [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Derivative Asset Net, Fair Value		27,779
Fair value of derivative liabilities	79,491	90,857
Futures Contracts [Member] | Derivatives Liability [Member] | Consolidated Entity Excluding Variable Interest Entities VIE [Member] | Total Derivatives Held For Trading [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of derivative liabilities	1,975	627
Other Contracts [Member] | Derivatives Liability [Member] | Consolidated Entity Excluding Variable Interest Entities VIE [Member] | Total Derivatives Held For Trading [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of derivative liabilities		361
Third call option [Member] | Derivatives Assets [Member] | Consolidated Entity Excluding Variable Interest Entities VIE [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Derivative Asset Net, Fair Value		$ 6,055

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- Definition

Fair value of liability associated with derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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