Interest Expense, Net - Components Of Interest Expense, Net (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
Interest income	$ 578	$ 127	$ 1,398	$ 1,008
Interest expense	(26,809)	(28,250)	(79,537)	(84,344)
Total interest expense, net	$ (26,231)	$ (28,123)	$ (78,139)	$ (83,336)