Derivatives - Net Gains/(Losses) Recorded in Noninterest Income Relating to Instruments Not Designated as Hedges (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Other Non Interest Income Non Hedging Interest Rate Derivatives [Line Items]
Interest rate caps	$ 4,124	$ 3,548	$ 6,384	$ 5,693	$ 6,939	$ 3,752	$ 6,949	$ 5,091	$ 19,749	$ 22,731	$ 23,225
Interest Rate Caps [Member] | Not Designated as Hedging Instrument [Member]
Other Non Interest Income Non Hedging Interest Rate Derivatives [Line Items]
Interest rate caps									$ 110	$ (1,497)