Business Combinations - Estimates of Acquired Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Fair Value	$ 94,473	$ 28,307	$ 20,659
Weighted Average Estimated Useful Life (yrs)	12 years	8 years	8 years
Trademarks and tradenames
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Fair Value	$ 23,349	$ 9,834	$ 5,286
Weighted Average Estimated Useful Life (yrs)	15 years	15 years	15 years
Non-competition agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Fair Value	$ 7,254	$ 3,315	$ 2,096
Weighted Average Estimated Useful Life (yrs)	5 years	5 years	5 years
Backlog
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Fair Value	$ 4,878	$ 4,767	$ 0
Weighted Average Estimated Useful Life (yrs)	2 years 6 months	1 year 6 months	0 years