Fair Value Measurements - Additional Information (Detail) |
12 Months Ended | |
|---|---|---|
|
Dec. 31, 2016
USD ($)
vessel
shares
|
Jun. 01, 2016
vessel
|
|
| Time-charter Swap [Member] | ||
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] | ||
| Aframax equivalent vessel percent | 55.00% | 55.00% |
| Aframax equivalent vessel | vessel | 2 | 2 |
| Estimated average daily tanker rate | $ | $ 18,000 | |
| Warrant [Member] | Tanker Investments Ltd [Member] | ||
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] | ||
| Volatility rate | 47.83% | |
| Warrant [Member] | Tanker Investments Ltd [Member] | Maximum [Member] | ||
| Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] | ||
| Number of shares available through exercise of stock purchase warrant (in shares) | shares | 750,000 |