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Asset Dispositions, Asset Held for Sale and Asset Impairments - Additional Information (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 USD ($) Vessel | Mar. 31, 2020 USD ($) Vessel | Dec. 31, 2019 Vessel | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Jun. 30, 2020 USD ($) Vessel | Jun. 30, 2019 USD ($)
Long Term Purchase Commitment [Line Items] |  |  |  |  |  |  |
Number Of vessels held for sale |  |  |  |  |  | 46 |
Number of vessels sold | 14 | 8 |  |  |  | 22 |
Long-lived asset impairments | $ | $ 55,482 |  |  | $ 494 |  | $ 65,689 | $ (776)
Percentage reduction in the value of vessels |  |  |  |  |  | 10.00% |
Active Vessels |  |  |  |  |  |  |
Long Term Purchase Commitment [Line Items] |  |  |  |  |  |  |
Number Of vessels held for sale |  |  | 46 |  |  | 22 |
Number of additional vessels sold |  |  |  |  |  | 22 |
Number of vessels sold |  | 8 |  |  |  | 14 |
Number of revalued vessels sold |  |  |  |  | 38 | 24 |
Long-lived asset impairments | $ |  |  |  |  | $ 10,200 | $ 5,600 |
Impairment expense | $ |  |  |  |  |  | $ 49,900 |
Stacked and Active Vessels |  |  |  |  |  |  |
Long Term Purchase Commitment [Line Items] |  |  |  |  |  |  |
Number Of vessels held for sale |  |  |  |  |  | 22 |
Number of vessels sold |  |  |  |  |  | 25 |
Number Of Vessels Active | 3 |  |  |  |  | 3 |
Gains on the asset sales | $ | $ 1,700 | $ 5,300 |  |  |  | $ 7,000 |

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