Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Allowance for Doubtful Accounts Receivable [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	$ 2,867	$ 4,298
Additions, Charge to Costs and Expenses	253	919
Additions, Other		56
Deductions From Reserves	(2,257)	(2,406)
Balance at End of Year	863	2,867
Valuation Allowances for Deferred Tax Assets [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	22,879	16,576
Additions, Charge to Costs and Expenses	22,146	6,822
Additions, Other	1,465
Deductions From Reserves		(519)
Balance at End of Year	$ 46,490	$ 22,879