Commitments and Contingencies - Additional Information - Vessels Under Construction (Detail) $ in Thousands	9 Months Ended
Sep. 30, 2017 USD ($) vessel	Dec. 31, 2016 USD ($)
Long-term Purchase Commitment [Line Items]
Payments made towards commitments for construction of certain carriers and tankers	$ 492,800	$ 987,658
Newbuildings
Long-term Purchase Commitment [Line Items]
Expected cost of project	1,700,000
Payments made towards commitments for construction of certain carriers and tankers	500,000
Estimated remaining payments required to be made under newbuilding contract remainder of 2017	377,000
Estimated remaining payments required to be made under newbuilding contract in 2018	536,700
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	8
Newbuildings \| Delivery in 2017 \| Liquefied Natural Gas
Long-term Purchase Commitment [Line Items]
Number of vessels \| vessel	2
Newbuildings \| Delivery in 2018 \| Liquefied Natural Gas
Long-term Purchase Commitment [Line Items]
Number of vessels \| vessel	4
Newbuildings \| Delivery in 2019 \| Liquefied Natural Gas
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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+ 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 third 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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- 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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