Accrued Expenses (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Schedule of Accrued Liabilities [Line Items]
Accrued interest	$ 7,305	$ 7,205
Accrued compensation and benefits	45,408	55,030
Other accrued expenses	37,544	36,174
Accrued expenses	$ 90,257	$ 98,409