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Long-term Debt - Schedule of Debt (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]    
Term loan, net of unamortized debt issuance costs of $5,026 and $5,146, respectively $ 392,724 $ 293,354
Vehicle and equipment notes, maturing September 2023; payable in various monthly installments, including interest rates ranging from 2.5% to 4.8% 59,992 50,357
Various notes payable, maturing through March 2025; payable in various monthly installments, including interest rates ranging from 4% to 6% 3,517 3,866
Total long term debt 456,233 347,577
Total long term debt 456,233 347,577
Less: current maturities (22,481) (16,650)
Long-term debt, less current maturities $ 433,752 $ 330,927