Goodwill and Intangibles - Schedule of Gross Carrying Amount, Accumulated Amortization and Net Book Value (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 126,814	$ 96,448
Accumulated Amortization	40,497	29,230
Net Book Value	86,317	67,218
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	80,909	62,399
Accumulated Amortization	27,533	20,231
Net Book Value	53,376	42,168
Covenants Not-to-compete [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	8,602	5,729
Accumulated Amortization	2,466	847
Net Book Value	6,136	4,882
Trademarks and Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	37,303	28,320
Accumulated Amortization	10,498	8,152
Net Book Value	$ 26,805	$ 20,168