NON-CONSOLIDATED VARIABLE INTEREST ENTITIES AND SERVICING ASSETS - Changes in Impairment Allowance (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
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items]
Balance at beginning of period	$ 118	$ 2,239	$ 2,725	$ 434
Temporary impairment charges	378	232	565	2,355
OTTI of servicing assets			(2,447)
Recoveries	(15)	(66)	(362)	(384)
Balance at end of period	$ 481	$ 2,405	$ 481	$ 2,405