v3.8.0.1

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 |

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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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