Summary of Amounts Recognized on Consolidated Statements of Operations Related to Company's Derivatives (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
Derivative Instruments, Gain (Loss) [Line Items]
Total	$ (87)		$ (677)		$ (569)		$ (2,679)
Interest Rate Swap
Derivative Instruments, Gain (Loss) [Line Items]
Loss on derivative instruments - realized	(127)	[1]	(475)	[1]	(796)	[1]	(1,388)	[1]
Loss on derivative instruments - unrealized	50		343		414		(1,923)
Interest Rate Cap
Derivative Instruments, Gain (Loss) [Line Items]
Loss on derivative instruments - unrealized	$ (10)		$ (545)		$ (187)		$ 632

[1] Realized losses represent net amounts accrued for the Company's derivative instruments during the period.