Number of units for maintenance and safety.

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Number of Hulls

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- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Face (par) amount of debt instrument at time of issuance.

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Amount of gain (loss) from the difference between the sale price or salvage price and the book value of an asset that was sold or retired, and gain (loss) from the write down of assets from their carrying value to fair value.

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No definition available.

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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.

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Amount of loss contingency liability.

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Amount of increase (decrease) in loss contingency liability.

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The estimated maximum amount of possible loss from the contingency.

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The estimated minimum amount of possible loss from the contingency.

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Amount of asset related to consideration paid in advance for costs that provide economic benefits within a future period of one year or the normal operating cycle, if longer.

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Commitments and Contingencies - Additional Information - Logitel (Detail) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Aug. 31, 2014 MaintenanceAndSafety	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Feb. 29, 2016 USD ($) hull	Dec. 31, 2015 USD ($)	Aug. 11, 2014
Loss Contingencies [Line Items]
(Write down) and gain on sale of vessel		$ (43,650)	$ (500)	$ (43,650)	$ (14,353)
Payments made towards commitments		37,619		37,619			$ 34,027
UMS Segment [Member]
Loss Contingencies [Line Items]
(Write down) and gain on sale of vessel		(43,650)	$ (500)	(43,650)	$ (500)
Reversed contingent liabilities		14,549		14,500
Logitel Offshore Holding [Member]
Loss Contingencies [Line Items]
Percentage of noncontrolling interest acquired	100.00%							100.00%
Number of units for maintenance safety \| MaintenanceAndSafety	3
Sevan Marine ASA [Member] \| Logitel Offshore Holding [Member]
Loss Contingencies [Line Items]
Number of hulls to be converted \| hull						2
Loan facility						$ 60,000
Sevan and Cosco [Member]
Loss Contingencies [Line Items]
Loss contingency accrual		58,000		58,000
Vendor Credit Loan [Member] \| Sevan Marine ASA [Member] \| Logitel Offshore Holding [Member]
Loss Contingencies [Line Items]
Loan facility						41,000
Cash Loan [Member] \| Sevan Marine ASA [Member] \| Logitel Offshore Holding [Member]
Loss Contingencies [Line Items]
Loan facility						$ 19,000
Stavanger Spirit [Member]
Loss Contingencies [Line Items]
Estimate of damages, maximum		170,000		170,000
Nantong Spirit [Member]
Loss Contingencies [Line Items]
Estimate of damages, maximum		40,000		40,000
Estimate of damages, minimum		$ 10,000		$ 10,000