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Goodwill and Intangibles - Schedule of Gross Carrying Amount and Accumulated Amortization (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 225,988	$ 204,558
Accumulated Amortization	86,279	66,567
Net Book Value	139,709	137,991
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	135,900	121,015
Accumulated Amortization	48,668	38,651
Net Book Value	87,232	82,364
Covenants Not-to-Compete [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	13,780	11,807
Accumulated Amortization	6,826	4,773
Net Book Value	6,954	7,034
Trademarks and Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	62,248	58,136
Accumulated Amortization	17,166	14,076
Net Book Value	45,082	44,060
Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	14,060	13,600
Accumulated Amortization	13,619	9,067
Net Book Value	$ 441	$ 4,533

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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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-Publisher FASB
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-Topic 350
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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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