Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Valuation Allowance for Deferred Tax Assets [Member]
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 331,589	$ 292,388	$ 208,061
Charged to Costs and Expenses	6,056	38,761	84,213
Charged to Other Accounts	(1,499)	440	114
Balance at End of Period	336,146	331,589	292,388
Allowance for Doubtful and Disputed Accounts [Member]
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	30,391	30,404	22,116
Charged to Costs and Expenses	89	3,698	11,674
Write-offs	(16,119)	(3,689)	(3,386)
Recoveries	(36)	(22)
Balance at End of Period	$ 14,325	$ 30,391	$ 30,404