Commitments and Contingencies - Additional Information - Vessels Under Construction (Detail) $ in Thousands	12 Months Ended
Dec. 31, 2017 USD ($) vessel	Dec. 31, 2016 USD ($)
Long-term Purchase Commitment [Line Items]
Payments made towards commitments for construction of certain carriers and tankers	$ 444,493	$ 987,658
Newbuildings
Long-term Purchase Commitment [Line Items]
Expected cost of project	1,200,000
Payments made towards commitments for construction of certain carriers and tankers	444,500
Estimated remaining payments required to be made under newbuilding contract in 2018	552,400
Estimated remaining payments required to be made under newbuilding contract in 2019	$ 252,100
Newbuildings \| Liquefied Natural Gas
Long-term Purchase Commitment [Line Items]
Number of vessels \| vessel	6
Newbuildings \| Delivery in 2018 \| Liquefied Natural Gas
Long-term Purchase Commitment [Line Items]
Number of vessels \| vessel	4
Newbuildings \| Delivery in 2019 \| Long Distance Towing and Offshore Installation
Long-term Purchase Commitment [Line Items]
Number of vessels \| vessel	2

Number Of Vessels In Partnership

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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

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

+ References

No definition available.

+ Details

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- Definition

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+ 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 next 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 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

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