Accrued Expenses (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Schedule of Accrued Liabilities [Line Items]
Accrued interest	$ 7,323	$ 7,275
Accrued compensation and benefits	43,167	50,305
Dividends Payable, Current	11,696	12,011
Other accrued expenses	35,245	37,876
Accrued expenses	$ 97,431	$ 107,467