Derivatives - Credit Value Adjustment Recorded Related to Notional Amount of Derivatives Outstanding (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Derivative [Line Items]
Derivative, Fair Value, Net	$ 77	$ (2,207)
Interest rate swap [Member]
Derivative [Line Items]
Derivative, Notional Amount	274,718	223,448
Interest Rate Cap [Member]
Derivative [Line Items]
Derivative, Notional Amount	7,500	0
Credit Default Swap, Buying Protection [Member]
Derivative [Line Items]
Derivative, Notional Amount	82,197	71,390
Credit Default Swap, Selling Protection [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ (19,161)	$ 0