Business Combinations - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) business	Dec. 31, 2020 USD ($) business	Dec. 31, 2019 USD ($) business
Business Acquisition [Line Items]
Number of businesses acquired | business	11	9	6
Acquisition-related costs	$ 2,800	$ 2,800	$ 2,100
Goodwill acquired expected to be tax deductible	100,500
Amortization	37,079	28,535	24,510
Interest expense	32,842	30,291	28,104
Income tax expense (benefit)	$ 36,712	33,938	24,446
Combined Business Acquisitions
Business Acquisition [Line Items]
Percentage of voting equity interests acquired	100.00%
Amortization	$ 8,200	18,200	10,200
Interest expense	4,100	4,300
Income tax expense (benefit)	$ 3,900	$ 3,700	$ 3,000