Number of subsidiaries under agreement.

No definition available.

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- Definition

Number Of Vessels

+ References

No definition available.

+ Details

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- Definition

Proceeds From Escrow Deposit By Reimbursement In Cash

+ References

No definition available.

+ Details

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- Definition

Weight Capacity

+ References

No definition available.

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- Definition

The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy.

+ References

Reference 1: 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

+ Details

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- Definition

Amount of judgment or settlement awarded to (against) the entity in respect of litigation.

+ References

No definition available.

+ 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

Amount of receivable related to a loss contingency accrual. For example, an insurance recovery receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12053-110248

+ Details

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- Details

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- Details

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- Details

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- Details

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Commitments and Contingencies - Additional Information - STX Offshore & Shipbuilding Co. (Detail)	1 Months Ended			2 Months Ended	12 Months Ended
	Feb. 29, 2016 USD ($)	May. 31, 2015 USD ($)	Apr. 30, 2013 Subsidiaries Vessel DWT	Nov. 30, 2013 Vessel	Dec. 31, 2016 USD ($)	Nov. 30, 2014 USD ($)
Loss Contingencies [Line Items]
Litigation settlement amount		$ 55,000,000
STX [Member]
Loss Contingencies [Line Items]
Weight capacity in dead-weight tonne \| DWT			113,000
Number of special purpose subsidiary companies under agreement \| Subsidiaries			4
STX [Member] \| Subsequent Events [Member]
Loss Contingencies [Line Items]
Refund of cash deposit held in escrow					$ 600,000
Litigation settlement amount	$ 32,400,000
Receivable recorded	$ 0
Cash and Cash Equivalents [Member] \| STX [Member]
Loss Contingencies [Line Items]
Amount of escrow account placed						$ 600,000
Orders to Construct Newbuildings [Member] \| STX [Member]
Loss Contingencies [Line Items]
Number of vessels \| Vessel			4
Additional Order Option Maximum [Member] \| STX [Member]
Loss Contingencies [Line Items]
Number of vessels \| Vessel			12
Option To Order Exercised [Member] \| STX [Member]
Loss Contingencies [Line Items]
Number of vessels \| Vessel				8