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Accrued and Other Current Liabilities - Schedule of Accrued Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Payables and Accruals [Abstract]    
Salaries & wages $ 6,240 $ 5,949
Incentive compensation 8,991 1,576
Income taxes 930 587
Interest 8,108 8,057
Vacation payable 7,619 5,700
Group medical 1,344 1,892
Transportations tax 971 427
Operating lease 710 769
Workers compensation 959 865
Other 5,978 2,524
Total accrued liabilities $ 41,850 $ 28,346