Goodwill and Intangibles - Schedule of Gross Carrying Amount and Accumulated Amortization (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 375,958	$ 316,454
Accumulated Amortization	171,858	145,061
Net Book Value	204,100	171,393
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	240,756	197,641
Accumulated Amortization	106,997	89,137
Net Book Value	133,759	108,504
Covenants not-to-compete
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	24,973	20,309
Accumulated Amortization	15,628	13,436
Net Book Value	9,345	6,873
Trademarks and tradenames
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	89,804	79,657
Accumulated Amortization	31,164	27,245
Net Book Value	58,640	52,412
Backlog
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	20,425	18,847
Accumulated Amortization	18,069	15,243
Net Book Value	$ 2,356	$ 3,604