Vessels Under Construction (Detail) $ in Thousands	9 Months Ended
Sep. 30, 2018 USD ($) vessel	Dec. 31, 2017 USD ($)
Long-term Purchase Commitment [Line Items]
Payments made towards commitments for construction of certain carriers and tankers	$ 172,248	$ 444,493
Newbuildings
Long-term Purchase Commitment [Line Items]
Expected cost of project	422,000
Payments made towards commitments for construction of certain carriers and tankers	172,200
Estimated remaining payments required to be made under newbuilding contract remainder of 2018	2,300
Estimated remaining payments required to be made under newbuilding contract in 2019	$ 247,700
Newbuildings \| Liquefied Natural Gas
Long-term Purchase Commitment [Line Items]
Number of vessels \| vessel	2
Credit facility, maximum borrowing capacity	$ 119,000
One of two vessels with undrawn financing \| vessel	1
Newbuildings \| Delivery in 2019 \| Liquefied Natural Gas
Long-term Purchase Commitment [Line Items]
Number of vessels \| vessel	2

Number Of Vessels

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- Definition

One Of Two Vessels With Undrawn Financing

+ References

No definition available.

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- Definition

Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ 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 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

The minimum amount the entity agreed to spend under the long-term purchase commitment.

+ References

No definition available.

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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.

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- Definition

Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77896938&loc=d3e25336-109308

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- Definition

Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

No definition available.

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