Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Valuation Allowance [Line Items]
Income tax expense	$ 5,334	$ 2,192
Goodwill acquired	2,600
UNITED KINGDOM
Valuation Allowance [Line Items]
Deferred tax asset, valuation allowance	1,200
SWEDEN
Valuation Allowance [Line Items]
Deferred tax asset, valuation allowance	$ 2,300