Schedule of Gains and Losses on Derivatives Designated as Cash Flow Hedges (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Gain or (loss) recognized in AOCI on derivatives (effective portion)	$ (35)	[1]	$ (292)	[1]	$ (244)	[1]	$ (170)	[1]
Gain or (loss) reclassified from AOCI into income (effective portion)	(249)	[1]	(269)	[1]	(532)	[1]	(551)	[1]
Gain or (loss) recognized in income on derivatives (ineffective portion and amount excluded from effectiveness testing)	$ 1	[1]			$ 1	[1]	$ (1)	[1]

[1] Losses on derivatives reclassified from accumulated other comprehensive income ("AOCI") into income (effective portion) were included in "Interest expense" in the Condensed Consolidated Statements of Operations.