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Goodwill and Intangibles - Schedule of Gross Carrying Amount and Accumulated Amortization (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 316,454	$ 270,091
Accumulated Amortization	145,061	116,529
Net Book Value	171,393	153,562
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	197,641	169,334
Accumulated Amortization	89,137	69,388
Net Book Value	108,504	99,946
Covenants not-to-compete
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	20,309	16,959
Accumulated Amortization	13,436	10,617
Net Book Value	6,873	6,342
Trademarks and tradenames
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	79,657	69,718
Accumulated Amortization	27,245	22,609
Net Book Value	52,412	47,109
Backlog
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	18,847	14,080
Accumulated Amortization	15,243	13,915
Net Book Value	$ 3,604	$ 165

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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