Accrued Expenses (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Schedule of Accrued Liabilities [Line Items]
Accrued interest	$ 2,998	$ 7,205
Accrued compensation and benefits	30,117	55,030
Other accrued expenses	32,176	36,174
Accrued expenses	$ 65,291	$ 98,409