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Segment Reporting - Reconciliation of Total Segment Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | --- | --- | ---
Segment Reporting Information [Line Items] |  |  |  |
Total assets | $ 3,910,923 | $ 3,760,454 |  |
Cash and cash equivalents | 102,481 | 159,639 | $ 139,481 | $ 113,577
Accounts receivable and prepaid expenses | 26,550 | 15,240 |  |
Advances to affiliates | 13,026 | 11,942 |  |
Consolidated total assets | 4,052,980 | 3,947,275 |  |
Liquefied Gas Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total assets | 3,550,396 | 3,379,279 |  |
Conventional Tankers [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total assets | $ 360,527 | $ 381,175 |  |

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + 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 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 + Details
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