Accrued Expenses (Detail) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Equity, Class of Treasury Stock [Line Items]
Accrued interest	$ 7,352	$ 6,710
Accrued compensation and benefits	40,803	57,781
Other accrued expenses	37,434	35,121
Accrued expenses	$ 85,589	$ 99,612