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

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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

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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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The value (monetary amount) of the award the plaintiff seeks in the legal matter.

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Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

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Commitments and Contingencies - Additional Information - Logitel (Details)	1 Months Ended		3 Months Ended
	Feb. 28, 2015 maintenance_and_safety_unit	Aug. 31, 2014 maintenance_and_safety_unit hull	Mar. 31, 2018 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jun. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2013 USD ($)
Loss Contingencies [Line Items]
Loss contingency accrual				$ 43,000,000
Total principal				3,014,628,000	$ 3,173,229,000
Stavanger Spirit \| Maximum
Loss Contingencies [Line Items]
Estimate of possible loss								$ 170,000,000
Estimated claim			$ 186,200,000
Nantong Spirit \| Logitel Offshore Rig III LLC
Loss Contingencies [Line Items]
Portion not accrued						$ 51,900,000
Nantong Spirit \| Minimum
Loss Contingencies [Line Items]
Estimate of possible loss				10,000,000
Nantong Spirit \| Maximum
Loss Contingencies [Line Items]
Estimate of possible loss				40,000,000
Logitel
Loss Contingencies [Line Items]
Percentage of noncontrolling interest acquired		100.00%
Number of units for maintenance safety \| maintenance_and_safety_unit	1	3
Logitel \| Sevan Marine ASA
Loss Contingencies [Line Items]
Number of units for maintenance safety \| hull		2
Loan facility							$ 50,000,000.0
Total principal				$ 50,000,000					$ 60,000,000
Logitel \| Sevan Marine ASA \| Cash Loan
Loss Contingencies [Line Items]
Loan facility									19,000,000
Logitel \| Sevan Marine ASA \| Vendor Credit Loan
Loss Contingencies [Line Items]
Loan facility									$ 41,000,000