Components of Interest Expense (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Component of Other Expense, Nonoperating [Line Items]
Interest on borrowings and related fees	$ 51,384	$ 43,060	$ 33,374
Accretion on original issue discount	3,427	8,109	7,523
Amortization of debt issuance costs	3,380	3,875	2,679
Interest rate swaps			3,969
Capitalized interest	(1,983)	(1,384)	(2,318)
Other, net	8	19	(996)
Interest expense	$ 56,216	$ 53,679	$ 44,231