The additional shares of common stock, per share exercised for holders of warrants.

No definition available.

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Namespace Prefix:	osgiq_
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Period Type:	duration

- Definition

Compensation expense recognized percentage target achievement level threshold.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
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Period Type:	duration

- Definition

Increase (decrease) in shares due to spinoff.

+ References

No definition available.

+ Details

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Namespace Prefix:	osgiq_
Data Type:	xbrli:sharesItemType
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Period Type:	duration

- Definition

Percentage threshold set by board of directors fo the entity for U.S. citizen ownerhip of outstanding stock.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Share based compensation arrangement by share based payment award equity instruments other than options additional grants in period.

+ References

No definition available.

+ Details

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Namespace Prefix:	osgiq_
Data Type:	xbrli:sharesItemType
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Period Type:	duration

- Definition

Share based compensation arrangement by share based payment award, fair value assumptions, expected volatility factors.

+ References

No definition available.

+ Details

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Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Definition

Share ratio issued as dividend.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were cancelled during the reporting period.

+ References

No definition available.

+ Details

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Data Type:	xbrli:sharesItemType
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Period Type:	duration

- Definition

Shares Received Pursuant to Spinoff.

+ References

No definition available.

+ Details

Name:	osgiq_SharesReceivedPursuanttoSpinoff
Namespace Prefix:	osgiq_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Shares repurchased to cover employees tax withholding other than options.

+ References

No definition available.

+ Details

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Namespace Prefix:	osgiq_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Shares repurchased to cover employees tax withholding other than options, price per Share.

+ References

No definition available.

+ Details

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Namespace Prefix:	osgiq_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the amount of compensation expense (income) related to stock option grants.

+ References

No definition available.

+ Details

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Namespace Prefix:	osgiq_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

- Definition

Stock repurchaed during period, per share amount.

+ References

No definition available.

+ Details

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Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

- 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

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of warrants or rights outstanding.

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-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

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Face amount or stated value per share of common stock.

+ References

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Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

+ References

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Balance Type:	na
Period Type:	instant

- Definition

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

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Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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Period Type:	duration

- Definition

A fee charged for services from professionals such as doctors, lawyers and accountants. The term is often expanded to include other professions, for example, pharmacists charging to maintain a medicinal profile of a client or customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07.2(a),(b),(c),(d))
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-SubTopic 225
-Section 45
-Paragraph 3
-Subparagraph (k)
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Balance Type:	debit
Period Type:	duration

- Definition

The noncash expense that represents the cost of restricted stock or unit distributed to employees as compensation.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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-Subparagraph (b)
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-Paragraph 1
-Subparagraph (SAB Topic 5.P.3)
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Balance Type:	debit
Period Type:	duration

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

Additional share-based compensation cost recognized as a result of an occurrence of an event that accelerates its recognition.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
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Period Type:	duration

- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- 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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Data Type:	xbrli:stringItemType
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Period Type:	duration

- Definition

Number of additional shares authorized for issuance under an established share-based compensation plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ References

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Data Type:	xbrli:sharesItemType
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Period Type:	instant

- Definition

Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

+ References

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

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Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

+ References

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Period Type:	instant

- Definition

Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

+ References

No definition available.

+ Details

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- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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Period Type:	duration

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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Balance Type:	na
Period Type:	duration

- Definition

Percentage of vesting of share-based compensation awards.

+ References

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Balance Type:	na
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- Definition

Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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-Subparagraph (f)(2)(i)
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-Paragraph 1
-Subparagraph (SAB Topic 14.D.2)
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Namespace Prefix:	us-gaap_
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Balance Type:	na
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- Definition

Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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Period Type:	duration

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ References

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Period Type:	instant

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Number of shares issued during the period as a result of the conversion of convertible securities.

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-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
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-Subparagraph (SX 210.3-04)
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-Paragraph 3
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Data Type:	xbrli:sharesItemType
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Period Type:	duration

- Definition

Number of share options (or share units) exercised during the current period.

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-SubTopic 10
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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
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- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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CAPITAL STOCK AND STOCK COMPENSATION (Narrative) (Details)										1 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended
	Jun. 06, 2017 shares	Dec. 29, 2016 USD ($)	Nov. 30, 2016 shares	Nov. 18, 2016 shares	Jul. 29, 2016 USD ($)	Jun. 13, 2016	Oct. 12, 2015 $ / shares shares	Aug. 07, 2015 USD ($) shares	Mar. 03, 2015 USD ($) shares	Dec. 31, 2016 USD ($) $ / shares shares	Sep. 30, 2016 USD ($)	Sep. 30, 2017 $ / shares	Dec. 31, 2017 USD ($) item $ / shares shares	Dec. 31, 2016 USD ($) item $ / shares shares	Dec. 31, 2015 USD ($) item $ / shares shares	Jun. 23, 2016 shares	Jun. 02, 2016 $ / shares	Feb. 29, 2016 $ / shares	Dec. 31, 2014 $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock split, conversion ratio						0
The additional shares of common stock, per share exercised													10.00%
Percentage threshold set by board of directors for the entity for U.S. citizen ownerhip of outstanding stock													77.00%
Dividends payable, amount per share (USD per share) \| $ / shares																		$ 0.08
Stock repurchased during period, value \| $														$ 119,343,000
Exercise price range, options outstanding, weighted average exercise price (USD per share) \| $ / shares										$ 6.69			$ 5.27	$ 6.69					$ 2.96
Severance costs \| $													$ 16,000	$ 12,996,000	$ 0
Increase in shares due to spinoff			581,332
Cancelled, other than options			177,635
Cancelled, options			205,427
Compensation relating to restricted stock/stock unit and stock option grants \| $													$ 2,388,000	7,441,000	3,580,000
Options outstanding, weighted average remaining term													7 years 3 months 29 days
Stock options, compensation expense (income) \| $													$ 0	$ 2,243,000	$ 441,000
Share based compensation expense, unrecognized \| $													$ 1,770,000
Nonvested awards, compensation cost not yet recognized, period for recognition													1 year 10 months 13 days
Class A Warrant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants outstanding													50,306,574
Class A Warrant Repurchase Average $11.31 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchased during period, shares														55,306,351
Stock repurchase during period, per share amount (USD per share) \| $ / shares														$ 11.31
Stock repurchased during period, value \| $														$ 118,041
Class A Warrant Repurchase Average $16.25 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchased during period, shares															1,219,202
Stock repurchase during period, per share amount (USD per share) \| $ / shares															$ 16.25
Stock repurchased during period, value \| $															$ 3,633
Post Adjustment Range $2.85 and $3.20 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Lower range, price (USD per share) \| $ / shares													$ 4.04
Upper range, price (USD per share) \| $ / shares													$ 5.57
Messrs. Greene and Semaca Quarterly Fee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Professional fees \| $													$ 37,000
Former President and Chief Executive Officer and Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accelerated compensation cost \| $										$ 1,251,000
Severance costs \| $											$ 2,238,000
Former Senior Vice President and Chief Financial Office [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accelerated compensation cost \| $										$ 984,000
Former President US Flag Operatons [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accelerated compensation cost \| $					$ 789,000									789,000
Severance costs \| $														$ 2,238,000
Performance Based Restricted Units [Member] \| Management [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted													38,547
Granted, per share \| $ / shares													$ 11.82
Performance Based Restricted Units [Member] \| Senior Officers [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted							115,640						119,853
Granted, per share \| $ / shares													$ 11.82
Threshold goal for compensation expense achievement percentage													100.00%	130.00%
Performance Based Restricted Units [Member] \| Senior Officers [Member] \| Share-based Compensation Award, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted							38,547
Granted, per share \| $ / shares							$ 14.51
Performance Based Restricted Units [Member] \| Senior Officers [Member] \| Vesting subject to OSG’s three-year earnings per share (“EPS”) performance in the three-year EPS performance period relative to a compounded annual growth rate
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement, award vesting rights percentage														33.30%
Performance Based Restricted Units [Member] \| Senior Officers [Member] \| Vesting subject to OSG’s ROIC performance in the three-year ROIC performance period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement, award vesting rights percentage														33.30%
Performance Based Restricted Units [Member] \| Senior Officers [Member] \| Vesting subject to OSG’s TSR performance relative to that of a performance peer group
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement, award vesting rights percentage														33.30%
Time Based Restricted Stock [Member] \| Certain Employees and Senior Officers [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted													165,017	381,922	280,545
Granted, per share \| $ / shares													$ 4.04	$ 9.93	$ 18.65
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Lower range, price (USD per share) \| $ / shares													3,350.00
Upper range, price (USD per share) \| $ / shares													$ 4,000.00
Restricted Stock Unit Related To Total Shareholder Return [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, per share \| $ / shares												$ 4.04
Restricted Stock and Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted													586,194	614,523	871,439
Forfeited													(164,387)	(88,228)	(4,342)
Lower range, price (USD per share) \| $ / shares													$ 2.28	$ 2.87	$ 3.00
Upper range, price (USD per share) \| $ / shares													$ 4.04	$ 21.90	$ 3.65
Increase in shares due to spinoff			430,841
Restricted Stock Unit Related To Return On Invested Capital [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of additional shares authorized													47,647
Restricted Stock Unit Related To Return On Invested Captial And Total Shareholder Return [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of additional shares authorized													95,294
Common Class And Common Class B [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share ratio issued as dividend													0.10%
Common Class A [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of securities callable													9,558,249
Common stock, shares outstanding										70,271,172			78,277,669	70,271,172
Common stock, par value (in dollars per share) \| $ / shares										$ 0.01			$ 0.01	$ 0.01			$ 10.00
Class of warrant right, number of securities called by each warrant or right																0.19
Shares repurchased to cover employees tax withholding other than options, shares													246,461	25,885
Shares repurchased to cover employees tax withholding other than options, price per share \| $ / shares													$ 4.55	$ 14.06
Stock repurchased during period, shares														106,350
Stock repurchase during period, per share amount (USD per share) \| $ / shares														$ 12.23
Stock repurchased during period, value \| $														$ 1,301,000
Stock issued during period, shares, conversion of convertible securities													7,629,319	8,247,648	3,277,309
Granted, options														528,304
Common Class A [Member] \| Class A Warrant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options exercised in period													40,269,797	43,835,170	19,688,119
Common Class A [Member] \| Senior Officers [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period													3 years
Granted, options													135,084	528,304	182,310
Exercise price range, options outstanding, weighted average exercise price (USD per share) \| $ / shares													$ 4.04		$ 17.10
Lower range, price (USD per share) \| $ / shares														$ 3.73
Upper range, price (USD per share) \| $ / shares														12.69
Grants, options, per share \| $ / shares													$ 1.89	$ 10.83	$ 8.40
Common Class A [Member] \| Restricted Stock [Member] \| Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted													253,700	74,201	54,881
Granted, per share \| $ / shares													$ 2.68	$ 11.64	$ 18.87
Common Class A [Member] \| Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options exercised in period													0	0	0
Granted, options													135,804		182,310
Cancelled, options													737,669	55,971
Common Class B [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, par value (in dollars per share) \| $ / shares																	$ 0.01
Stock issued during period, shares, conversion of convertible securities														7,833	396,025
Common Class B [Member] \| Class A Warrant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options exercised in period														46,997	2,381,811
Management Incentive Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value assumptions, risk free interest rate													2.09%	1.65%	1.80%
Fair value assumptions, price volatility factors \| item													0.47	0.40	0.37
Management Incentive Compensation Plan [Member] \| Weighted Average [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value assumptions, expected dividend rate														0.00%	0.00%
Fair value assumptions, expected life													6 years	6 years	6 years
Management Incentive Compensation Plan [Member] \| Performance Based Restricted Units [Member] \| Senior Officers [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted													63,532
Vesting period													3 years
Management Incentive Compensation Plan [Member] \| Performance Based Restricted Units [Member] \| Senior Officers [Member] \| Vesting subject to OSG’s return on invested capital (“ROIC”) performance
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement, award vesting rights percentage													50.00%
Management Incentive Compensation Plan [Member] \| Performance Based Restricted Units [Member] \| Senior Officers [Member] \| Vesting subject to OSG’s three-year total stockholder return (“TSR”) performance relative to that of a performance peer group
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement, award vesting rights percentage													50.00%
Management Incentive Compensation Plan [Member] \| Employee Stock Option [Member] \| Senior Officers [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, options													103,945
Grants in period, weighted average grant date fair value (USD per share) \| $ / shares													$ 2.81
Management Incentive Compensation Plan [Member] \| Common Class A [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized													6,783,333
Non-Employee Director Incentive Compensation Plan [Member] \| Mr. John J. Ray, III [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted															9,722
Vested or expected to vest, shares									5,380
Forfeited									(4,342)
Restricted stock or unit expense \| $									$ 8,000
Non-Employee Director Incentive Compensation Plan [Member] \| Mr. Alex Greene and Mr. Nick Semaca [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted								20,829
Non-Employee Director Incentive Compensation Plan [Member] \| Common Class A [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized													2,050,000
Non-Employee Director Incentive Compensation Plan [Member] \| Common Class A [Member] \| Mr. Alex Greene and Mr. Nick Semaca [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock or unit expense \| $								$ 189,000
Non-Employee Director Incentive Compensation Plan [Member] \| Common Class A [Member] \| Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional grants issued in period	1,500,000
Incentive Plans and 2004 Plan [Member] \| Restricted Stock, Restricted Stock Units and Performance Awards [Member].
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation relating to restricted stock/stock unit and stock option grants \| $													$ 2,107,000	$ 5,198,000	$ 3,139,000
Proskauer Action [Member] \| Common Class B [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares outstanding													7,926,805
Employment Letter Agreement [Member] \| Former President and Chief Executive Officer and Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accelerated compensation cost \| $		$ 2,313,000
Severance costs \| $													$ 5,333,000
Employment Letter Agreement [Member] \| Former Senior Vice President and Chief Financial Office [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accelerated compensation cost \| $		$ 1,676,000
Severance costs \| $													$ 3,342,000
Employment Letter Agreement [Member] \| Former President US Flag Operatons [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accelerated compensation cost \| $					$ 23,000
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchased during period, value \| $														$ 5,000
Warrants Related to Spinoff [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares received pursuant to spinoff				0.063327
International Seaways Incorporated [Member] \| Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares received pursuant to spinoff			0.3333	0.3333
International Seaways Incorporated [Member] \| Warrants Related to Spinoff [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares received pursuant to spinoff			0.3333