Accrued Expenses (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Schedule of Accrued Liabilities [Line Items]
Accrued interest	$ 3,046	$ 7,275
Accrued compensation and benefits	30,658	50,305
Dividends Payable, Current	12,024	12,011
Other accrued expenses	33,433	37,876
Accrued expenses	$ 79,161	$ 107,467