Accrued Liabilities (Detail) - USD ($) $ in Thousands |
Sep. 30, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Payables and Accruals [Abstract] | ||
| Accrued payroll and employee benefits | $ 1,402 | $ 5,839 |
| Accrued insurance | 4,546 | 5,896 |
| Accrued legal and environmental costs | 1,595 | 1,531 |
| Accrued taxes (Note 11) | 2,629 | 1,514 |
| Accrued interest (Note 8) | 2,040 | 8,516 |
| Accrued operating costs | 4,231 | 4,233 |
| Accrued other | 1,838 | 2,314 |
| Total accrued liabilities | $ 18,281 | $ 29,843 |