Shareholders' Equity - Components of Accumulated Other Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Accumulated Other Comprehensive Income Loss [Line Items]
Foreign Currency Translation Gain (Loss), Beginning balance	$ (10,579)	$ (9,758)
Foreign Currency Translation Gain (Loss), Other Comprehensive (Loss)	1,036	885
Foreign Currency Translation Gain (Loss), Ending balance	(9,543)	(8,873)
Swap Fair Value Adjustment, Beginning balance	(13,085)	(1,928)
Swap Fair Value Adjustment, Other Comprehensive (Loss)	(2,438)	(10,756)
Swap Fair Value Adjustment, Ending balance	(15,523)	(12,684)
Accumulated Other Comprehensive Income (Loss), Beginning Balance	(23,664)	(11,686)
Accumulated Other Comprehensive Income (Loss), Other Comprehensive (Loss)	(1,402)	(9,871)
Accumulated Other Comprehensive Income (Loss), Ending Balance	$ (25,066)	$ (21,557)