Schedule II - Valuation And Qualifying Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Valuation And Qualifying Accounts [Abstract]
Beginning Balance	$ 36,047	$ 54,252	$ 45,320
Charged to Expenses/Against Revenue	8,089	9,592	20,095
Deferred Revenue Reclassification	(363)	(5,340)	1,116
Write-Offs, Net of Recoveries	(12,507)	(22,457)	(12,279)
Ending Balance	$ 31,266	$ 36,047	$ 54,252