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Supplementary Accrued Liabilities Information - Additional Information (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Accrued liabilities:    
Accrued payroll & related benefits $ 20,736 $ 27,252
Accrued interest expense 32 18,169
Accrued professional fees & other 9,578 7,888
Deferred mobilization fees 4,082 3,149
Workers’ compensation liabilities, net 957 1,265
Total accrued liabilities $ 35,385 $ 57,723