Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allowance for Doubtful Receivables [Member]
Valuation And Qualifying Accounts Disclosure [Line Items]
Valuation and qualifying accounts, beginning balance	$ 4,072	$ 400	$ 1,057
Charged to costs and expenses	2,008	3,426	85
Charged to other accounts	1,600	(246)	742
Valuation and qualifying accounts, ending balance	4,480	4,072	400
Deferred Tax Asset Valuation Allowance [Member]
Valuation And Qualifying Accounts Disclosure [Line Items]
Valuation and qualifying accounts, beginning balance	46,471	40,347	32,550
Charged to costs and expenses	2,499	6,124	6,458
Deductions			1,339
Valuation and qualifying accounts, ending balance	$ 48,970	$ 46,471	$ 40,347