Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allowance for Doubtful Accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	$ 5,369	$ 5,540	$ 5,610
Charged to costs and expenses (2)	2,015	375	1,649
Deductions from reserves, net	2,524	546	1,719
Balance at end of year	4,860	5,369	5,540
Income Tax Valuation Allowance
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	5,039	4,559	5,303
Charged to costs and expenses (2)	1,138	859	906
Deductions from reserves, net	241	379	1,650
Balance at end of year	$ 5,936	$ 5,039	$ 4,559