Schedule II - Valuation and Qualifying Accounts(Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 1,425	$ 1,651	$ 1,841
Charged to Operations	2,414	1,016	1,078
Write-offs	(923)	(1,257)	(1,324)
Recoveries	1,129	15	56
Other Changes	0	0	0
Balance at End of Period	4,045	1,425	1,651
Valuation Allowance of Deferred Tax Assets [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	63,616	52,001	4,033
Charged to Operations	(7,518)	12,038	48,406
Write-offs	0	0	(438)
Recoveries	0	0	0
Other Changes	(762)	(423)	0
Balance at End of Period	$ 55,336	$ 63,616	$ 52,001