Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Allowance for Doubtful Accounts [Member]
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 978	$ 962
Charged to Costs and Expenses	2,078	275
Charged to Other Accounts	0	(1)
Deductions	(94)	(255)
Other	79	(3)
Balance at End of Period	3,041	978
Valuation Allowance Against Gross Deferred Income Tax Assets [Member]
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	33,881	26,933
Charged to Costs and Expenses	0	0
Charged to Other Accounts	9,954	7,910
Deductions	0	(181)
Other	(164)	(781)
Balance at End of Period	$ 43,671	$ 33,881