Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Valuation Allowance [Line Items]
Income tax (benefit) expense	$ (1,879)		$ 309	$ 3,455	$ 2,501
Uncertain tax positions	700			700
Income tax interest and penalties expense	500			500
Unrecognized tax benefits decrease resulting from settlements with taxing authorities	500			500
Unrecognized tax benefits income tax penalties and interest expense settlements with taxing authorities	400			400
Reduction from lapse of statute of limitations	200			200
Goodwill acquired		$ 2,600
UNITED KINGDOM
Valuation Allowance [Line Items]
Deferred tax asset, valuation allowance	1,200			1,200
SWEDEN
Valuation Allowance [Line Items]
Deferred tax asset, valuation allowance	$ 2,200			$ 2,200