Valuation and Qualifying Accounts (Detail) (Allowance for Doubtful Accounts [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 22,716	$ 28,323	$ 29,079
Additions Charged to Costs and Expenses	4,888	5,232	9,359
Deductions	(6,504)	(8,490)	(10,115)
Reclassifications	(492)	(2,349)
Balance at End of Period	$ 20,608	$ 22,716	$ 28,323