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Long-term Debt - Schedule of Debt (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]    
Term loan, net of unamortized debt issuance costs of $4,642 and $4,834, respectively $ 390,108 $ 390,916
Vehicle and equipment notes, maturing through March 2024; payable in various monthly installments, including interest rates ranging from 2.5% to 4.8% 60,811 60,391
Various notes payable, maturing through March 2025; payable in various monthly installments, including interest rates ranging from 4% to 6% 3,466 3,517
Total long term debt 454,385 454,824
Less: current maturities (23,925) (22,642)
Long-term debt, less current maturities $ 430,460 $ 432,182