Schedule II - Consolidated Valuation and Qualifying Accounts (Detail) - Allowance for doubtful accounts - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 3,395	$ 2,566	$ 2,550
Charged/(Credited) to Expense	2,314	1,785	1,115
Other Adjustments	14	208	(41)
Deductions	(2,833)	(1,164)	(1,058)
Balance at End of Period	$ 2,890	$ 3,395	$ 2,566