Fair Value Measurement - Reconciliation of All Assets Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3) (Detail) (Interest Rate Caps [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Jan. 11, 2013
Interest Rate Caps [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance of recurring Level 3 assets at beginning of period	$ 546		$ 436
Included in other income	2	138
Included in other comprehensive income
Purchases
Amortization	(129)	(130)
Sales
Balance of recurring Level 3 assets at end of period	$ 419	$ 444	$ 436