Commitments and Contingencies - Additional Information - Samsung (Details) $ in Millions	12 Months Ended	24 Months Ended
Dec. 31, 2017 USD ($) newbuilding	Dec. 31, 2020 vessel
Samsung Heavy Industries Co., Ltd.
Loss Contingencies [Line Items]
Number of newbuildings \| newbuilding	4
Aggregate fully built-up cost for shipbuilding contracts	$ 587.0
Payments made towards the commitment	24.0
Payments due in 2018	58.1
Payments due in 2019	225.4
Payments due in 2020	$ 279.8
Scenario, Forecast \| Statoil
Loss Contingencies [Line Items]
Number of vessels \| vessel		2
Scenario, Forecast \| North Sea CoA
Loss Contingencies [Line Items]
Number of vessels \| vessel		2

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Carrying amount as of the balance sheet date of expenditures made in advance of when the economic benefit of the cost will be realized, and which will be expensed in future periods with the passage of time or when a triggering event occurs.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.10)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.10)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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