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Summary of Significant Accounting Policies - Summary of Capitalized Dry Docking Costs (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Property, Plant and Equipment [Roll Forward] |  |  |
Balance at the beginning of the year | $ 9,138,886 |  |
Balance at the end of the year | 5,208,544 | $ 9,138,886 |
Dry-docking activity |  |  |
Property, Plant and Equipment [Roll Forward] |  |  |
Balance at the beginning of the year | 135,700 | 150,702 | $ 135,331
Costs incurred for dry dockings | 52,677 | 47,980 | 69,927
Dry-dock amortization | (49,686) | (55,026) | (47,271)
Write-down / sales of vessels | (49,319) | (7,956) | (7,285)
Balance at the end of the year | $ 89,372 | $ 135,700 | $ 150,702

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- Definition The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of assets over their estimated remaining economic lives. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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