v3.8.0.1

Derivative Instruments - Additional Information (Detail) |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 01, 2016 USD ($) vessel | Dec. 31, 2016 USD ($) vessel tranche $ / shares NOK / Derivative shares | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2016 vessel NOK / shares NOK / Derivative shares | Mar. 31, 2016 USD ($) agreement | Feb. 29, 2016 USD ($) agreement
Derivative [Line Items] |  |  |  |  |  |  |
Derivative Instruments Not Designated As Hedging Instruments Realized Gain (Loss) Net |  | $ (10,643,000) | $ (9,790,000) | $ (6,447,000) |  |  |
Description of objective |  | The Company enters into interest rate swap agreements which exchange a receipt of floating interest for a payment of fixed interest to reduce the Company’s exposure to interest rate variability on its outstanding floating-rate debt |  |  |  |  |
Unrealized Gain (Loss) on Derivatives |  | $ 9,679,000 | 8,193,000 | 11,676,000 |  |  |
Realized and unrealized loss on derivative instruments |  | $ (964,000) | (1,597,000) | 5,229,000 |  |  |
Tanker Investments Ltd [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Number of stock purchase warrants (in shares) | shares |  | 1 |  |  | 1 |  |
Interest Rate Swap [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative Instruments Not Designated As Hedging Instruments Realized Gain (Loss) Net |  | $ (12,797,000) | (9,790,000) | (9,993,000) |  |  |
Number of interest rate derivatives held | agreement |  |  |  |  |  |  | 9
Unrealized Gain (Loss) on Derivatives |  | 13,681,000 | 7,686,000 | 7,044,000 |  |  |
Interest Rate Swap, October 2016 Through December 2020 [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Number of interest rate derivatives held | agreement |  |  |  |  |  |  | 4
Notional amount |  |  |  |  |  |  | $ 50,000,000
Interest rate swaps fixed rate |  |  |  |  |  |  | 1.462%
Interest Rate Swap, Q1 2016 Through January 2021 [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Number of interest rate derivatives held | agreement |  |  |  |  |  | 5 |
Interest Rate Swap, Q1 2016 Through January 2021, $75 Million Notional Amount [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Number of interest rate derivatives held | agreement |  |  |  |  |  | 1 |
Notional amount |  |  |  |  |  | $ 75,000,000 |
Interest rate swaps fixed rate |  |  |  |  |  | 1.549% |
Interest Rate Swap, Q1 2016 Through January 2021, $50 Million Notional Amount [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Number of interest rate derivatives held | agreement |  |  |  |  |  | 1 |
Notional amount |  |  |  |  |  | $ 50,000,000 |
Interest rate swaps fixed rate |  |  |  |  |  | 1.155% |
Interest Rate Swap, Q1 2016 Through January 2021, $25 Million Notional Amount [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Number of interest rate derivatives held | agreement |  |  |  |  |  | 3 |
Notional amount |  |  |  |  |  | $ 25,000,000 |
Interest rate swaps fixed rate |  |  |  |  |  | 1.549% |
Warrant [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Unrealized Gain (Loss) on Derivatives |  | $ (4,877,000) | 507,000 | 1,237,000 |  |  |
Warrant [Member] | Tanker Investments Ltd [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Fixed price of stock purchase warrants, per share | (per share) |  | $ 10 |  |  | NOK 61.67 |  |
Number of tranches | tranche |  | 4 |  |  |  |  |
Consecutive trading days |  | 10 days |  |  |  |  |
Fair value of stock purchase warrant | tranche |  | 2 |  |  |  |  |
Warrant [Member] | Maximum [Member] | Tanker Investments Ltd [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Number of shares available through exercise of stock purchase warrant (in shares) | shares |  | 750,000 |  |  | 750,000 |  |
Warrant [Member] | Minimum [Member] | Tanker Investments Ltd [Member] | Tranche One [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Fair market value of the shares | NOK / Derivative |  | 77.08 |  |  | 77.08 |  |
Warrant [Member] | Minimum [Member] | Tanker Investments Ltd [Member] | Tranche Two [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Fair market value of the shares | NOK / Derivative |  | 92.5 |  |  | 92.5 |  |
Warrant [Member] | Minimum [Member] | Tanker Investments Ltd [Member] | Tranche Three [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Fair market value of the shares | NOK / Derivative |  | 107.91 |  |  | 107.91 |  |
Warrant [Member] | Minimum [Member] | Tanker Investments Ltd [Member] | Tranche Four [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Fair market value of the shares | NOK / Derivative |  | 123.33 |  |  | 123.33 |  |
Time-charter Swap [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative Instruments Not Designated As Hedging Instruments Realized Gain (Loss) Net |  | $ 2,154,000 | 0 | 3,546,000 |  |  |
Aframax equivalent vessel percent | 55.00% | 55.00% |  |  | 55.00% |  |
Aframax equivalent vessel | vessel | 2 | 2 |  |  | 2 |  |
Daily payments received | $ 27,776 |  |  |  |  |  |
Brokerage commission | 1.25% |  |  |  |  |  |
Deduction from daily payments made | $ 500 |  |  |  |  |  |
Derivative, term of contract | 11 months |  |  |  |  |  |
Term of contract extension, counterparty option | 2 months |  |  |  |  |  |
Unrealized Gain (Loss) on Derivatives |  | $ 875,000 | $ 0 | $ 3,395,000 |  |  |

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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 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 Number 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)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition The cap rate on a price risk derivative such as a cap or collar. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract. + References No definition available. + Details
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- Definition Description of the reasons for holding or issuing the derivative instrument. Includes discussion of the objective for holding the instrument, the context needed to understand that objective, and the strategy for achieving the objective. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579240-113959 + Details
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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The percentage of expected requirements covered by the aggregate notional amount of derivative contracts expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract as a percentage of expected need. + References No definition available. + Details
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- Definition Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Number of interest rate derivative instruments held by the entity at the reporting date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959 + Details
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