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Long-term Debt - Schedule of Debt (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]    
Term loans, in effect, net of unamortized debt issuance costs of $4,834 and $5,146, respectively $ 390,916 $ 293,354
Vehicle and equipment notes, maturing through December 2023; payable in various monthly installments, including interest rates ranging from 2.5% to 4.9% 60,391 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 454,824 347,577
Total long term debt 454,824 347,577
Less: current maturities (22,642) (16,650)
Long-term debt, less current maturities $ 432,182 $ 330,927