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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Property, Plant and Equipment [Line Items] |  |  |
Drydocking Cost Incurred | $ 60,608 | $ 44,690 | $ 50,899
Property, Plant and Equipment [Roll Forward] |  |  |
Balance at the beginning of the year | 5,517,133 |  |
Balance at the end of the year | 5,033,130 | 5,517,133 |
Dry-docking activity |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Drydocking Cost Incurred | 56,371 | 43,155 | 52,677
Property, Plant and Equipment [Roll Forward] |  |  |
Balance at the beginning of the year | 96,384 | 89,372 | 135,700
Dry-dock amortization | (39,283) | (33,684) | (49,686)
Write-down / sales of vessels | (2,901) | (2,459) | (49,319)
Balance at the end of the year | $ 110,571 | $ 96,384 | $ 89,372

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