Summary of Other Noninterest Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Disclosure Summary Of Other Noninterest Income [Abstract]
Unused commitment fees	$ 2,579		$ 1,900		$ 9,312		$ 5,194
Fund management fees	2,496		2,671		8,448		8,022
Service-based fee income	1,651		2,339		6,197		7,151
Net gains on the sale of certain assets related to our equity management services business	0		0		4,243		0
Loan syndication fees	1,353		50		2,853		920
Currency revaluation losses	845	[1]	(1,551)	[1]	(88)	[1]	(2,672)	[1]
Foreign Currency Transaction Gain (Loss) Foreign Currency Instruments	1,578	[2]	(3,931)	[2]	96	[2]	(733)	[2]
Other	2,921		1,630		8,104		5,502
Total other noninterest income	$ 13,423		$ 3,108		$ 39,165		$ 23,384

[1] revaluation of foreign currency denominated financial statements of certain funds. Included in these amounts are gains of $0.8 million and losses of $3 thousand for the three and nine months ended September 30, 2012, respectively, attributable to noncontrolling interests calculated based on the ownership percentages of the noncontrolling interests. This compares to losses of $1.7 million and $1.6 million for the comparable 2011 periods.

[2] of foreign currency denominated financial instruments issued and held by us, primarily loans, deposits and cash.