Accrued Expenses (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Schedule of Accrued Liabilities [Line Items]
Accrued interest	$ 7,205	$ 6,710
Accrued compensation and benefits	55,030	57,781
Other accrued expenses	36,174	35,121
Accrued expenses	$ 98,409	$ 99,612