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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 |

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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 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 + 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 + Details
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