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Financial Instruments - Additional Information (Detail) (Tanker Investments Limited [Member], Warrant [Member], USD $) In Millions, except Per Share data, unless otherwise specified | 6 Months Ended |  | 1 Months Ended
--- | --- | --- | ---
Jun. 30, 2014 | Jan. 31, 2014 | Jan. 31, 2014 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 |  |  | 1.5
Purchase price of common stock |  | $ 10 |
Expected volatility used in computing fair value of stock purchase warrants | 54.10% |  |

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- Definition Number of shares available through exercise of stock purchase warrants. + References No definition available. + Details
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- Definition Exercise price per share or per unit of warrants or rights outstanding. + 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)(4)) -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 (e) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Details
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