Vessels Under Construction (Detail) $ in Thousands	6 Months Ended
Jun. 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	$ 349,169	$ 444,493
Newbuildings
Long-term Purchase Commitment [Line Items]
Expected cost of project	800,000
Payments made towards commitments for construction of certain carriers and tankers	349,200
Estimated remaining payments required under newbuilding contract, remainder of 2018	244,100
Estimated remaining payments required under newbuilding contract, 2019	$ 250,000
Newbuildings \| Liquefied Natural Gas
Long-term Purchase Commitment [Line Items]
Number of vessels \| vessel	4
Debt instrument, principal amount	$ 371,000
Newbuildings \| Delivery Year, Remainder of fiscal year \| Liquefied Natural Gas
Long-term Purchase Commitment [Line Items]
Number of vessels \| vessel	2
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

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

+ Details

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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- Definition

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

+ References

No definition available.

+ Details

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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.

+ References

No definition available.

+ Details

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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.

+ Details

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