Valuation And Qualifying Accounts (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allowance for Doubtful Accounts
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at the beginning of the period		$ 5,489	$ 4,190	$ 3,181
Additions	[1]	124	1,912	2,269
Deduction		(3,976)	(613)	(1,260)
Balance at the end of the period		1,637	5,489	4,190
Valuation Allowance of Deferred Tax Assets
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at the beginning of the period		1,507	1,015	832
Additions	[1]	633	492	183
Deduction		(10)	0	0
Balance at the end of the period		$ 2,130	$ 1,507	$ 1,015

[1] Reductions in/charges to revenues and expenses.