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Business Combinations - Estimates of Acquired Intangible Assets (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Customer Relationships [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Estimated Fair Value $ 14,480 $ 37,533
Weighted Average Estimated Useful Life (yrs) 8 years 8 years
Trademarks and Trade Names [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Estimated Fair Value $ 3,920 $ 19,403
Weighted Average Estimated Useful Life (yrs) 14 years 15 years
Covenants Not-to-Compete [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Estimated Fair Value $ 1,530 $ 2,429
Weighted Average Estimated Useful Life (yrs) 5 years 5 years
Backlog [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Estimated Fair Value $ 460 $ 13,400
Weighted Average Estimated Useful Life (yrs) 2 years 1 year 6 months