Business Combinations - Estimates of Acquired Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Fair Value	$ 19,400	$ 45,300	$ 95,200
Weighted Average Estimated Useful Life (yrs)	12 years	12 years	12 years
Trademarks and tradenames
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Fair Value	$ 8,400	$ 16,800	$ 23,100
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	$ 1,100	$ 2,600	$ 7,100
Weighted Average Estimated Useful Life (yrs)	5 years	5 years	5 years
Backlog
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Fair Value	$ 800	$ 400	$ 1,600
Weighted Average Estimated Useful Life (yrs)	1 year	1 year	1 year 6 months