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Derivative Instruments - Summary of Location and Fair Values of Individual Derivative Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of derivative liabilities	$ (62,854)
Fair value of derivative liabilities	213,585	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	199,370	448,566
Fair value of derivative liabilities	604,579	687,867
Consolidated Entity Excluding Variable Interest Entities VIE [Member] | Derivatives held for trading [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Derivative Asset Net, Fair Value	199,370	442,511
Fair value of derivative liabilities	604,579	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	2,221,781	2,114,831
Derivatives liabilities [Member] | Consolidated Entity Excluding Variable Interest Entities VIE [Member] | Derivatives held for trading [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Derivative Asset Fair Value, Gross Liability	151,365	30,859
Fair value of derivative liabilities	220
Derivatives assets [Member] | Consolidated Entity Excluding Variable Interest Entities VIE [Member] | 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	(213,585)	(190,653)
Fair value of derivative liabilities	20,885	20,934
Credit derivatives [Member] | Derivatives liabilities [Member] | Consolidated Entity Excluding Variable Interest Entities VIE [Member] | Derivatives held for trading [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of derivative liabilities	213,585	190,653
Interest rate swaps [Member] | Derivatives liabilities [Member] | Consolidated Entity Excluding Variable Interest Entities VIE [Member] | Derivatives held for trading [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of derivative liabilities	390,774	251,303
Interest rate swaps [Member] | Derivatives liabilities [Member] | Variable interest entity [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of derivative liabilities	2,131,315	2,023,974
Interest rate swaps [Member] | Derivatives assets [Member] | Consolidated Entity Excluding Variable Interest Entities VIE [Member] | Derivatives held for trading [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Derivative Asset Net, Fair Value	46,752	411,652
Currency swaps [Member] | Derivatives liabilities [Member] | Consolidated Entity Excluding Variable Interest Entities VIE [Member] | 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 liabilities [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	90,466	90,857
Futures contracts [Member] | Derivatives liabilities [Member] | Consolidated Entity Excluding Variable Interest Entities VIE [Member] | Derivatives held for trading [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Fair value of derivative liabilities		627
Futures contracts [Member] | Derivatives assets [Member] | Consolidated Entity Excluding Variable Interest Entities VIE [Member] | Derivatives held for trading [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Derivative Asset Net, Fair Value	1,253
Other contracts [Member] | Derivatives liabilities [Member] | Consolidated Entity Excluding Variable Interest Entities VIE [Member] | 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

X

- 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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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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