Goodwill and Intangibles - Schedule of Gross Carrying Amount and Accumulated Amortization (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 185,319	$ 126,814
Accumulated Amortization	46,122	40,497
Net Book Value	139,197	86,317
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	108,983	80,909
Accumulated Amortization	29,659	27,533
Net Book Value	79,324	53,376
Covenants Not-to-compete [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	10,238	8,602
Accumulated Amortization	3,003	2,466
Net Book Value	7,235	6,136
Trademarks and Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	52,698	37,303
Accumulated Amortization	11,227	10,498
Net Book Value	41,471	$ 26,805
Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	13,400
Accumulated Amortization	2,233
Net Book Value	$ 11,167