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 Receivables [Member]
Valuation And Qualifying Accounts Disclosure [Line Items]
Valuation and qualifying accounts, beginning balance	$ 706	$ 279	$ 300
Charged to costs and expenses	226	403	157
Charged to other accounts	301	24	(51)
Deductions			(127)
Valuation and qualifying accounts, ending balance	1,233	706	279
Deferred Tax Asset Valuation Allowance [Member]
Valuation And Qualifying Accounts Disclosure [Line Items]
Valuation and qualifying accounts, beginning balance	12,913	11,235	12,204
Charged to costs and expenses	7,287	1,718	(1,048)
Charged to other accounts		(40)	21
Deductions			58
Valuation and qualifying accounts, ending balance	$ 20,200	$ 12,913	$ 11,235