Accrued Expenses (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Schedule of Accrued Liabilities [Line Items]
Accrued interest	$ 3,027	$ 7,205
Accrued compensation and benefits	42,470	55,030
Other accrued expenses	36,511	36,174
Accrued expenses	$ 82,008	$ 98,409