Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 1,058	$ 876
Additions, Charged to Income	1,392	1,119
Additions, Other Accounts	278	133
Deductions	(1,391)	(1,070)
Balance at End of Year	$ 1,337	$ 1,058