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Goodwill and Intangibles - Schedule of Gross Carrying Amount and Accumulated Amortization (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 192,098 $ 126,814
Accumulated Amortization 52,672 40,497
Net Book Value 139,426 86,317
Customer Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 113,606 80,909
Accumulated Amortization 32,517 27,533
Net Book Value 81,089 53,376
Covenants Not-to-compete [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 10,524 8,602
Accumulated Amortization 3,548 2,466
Net Book Value 6,976 6,136
Trademarks and Trade Names [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 54,568 37,303
Accumulated Amortization 12,140 10,498
Net Book Value 42,428 $ 26,805
Backlog [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 13,400  
Accumulated Amortization 4,467  
Net Book Value $ 8,933