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Asset Impairments, Asset Held for Sale and Other - Additional Information (Detail) | 1 Months Ended | 3 Months Ended | 4 Months Ended | 5 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jul. 31, 2017 USD ($) | Dec. 31, 2019 USD ($) Vessel | Sep. 30, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jun. 30, 2017 USD ($) | Jul. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2019 USD ($) Vessel | Dec. 31, 2018 USD ($)
Long Term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-lived asset impairments and other | $ 21,325,000 | $ 32,549,000 | $ 5,224,000 | $ 36,878,000 | $ 16,853,000 | $ 1,215,000 | $ 6,186,000 | $ 16,777,000 | $ 163,423,000 | $ 184,748,000 | $ 16,777,000 | $ 37,773,000 | $ 61,132,000
Other assets |  |  | $ 1,800,000 |  |  |  |  |  |  |  |  |  |
Impairment charge on under construction vessel |  | 5,800,000 |  |  |  |  |  |  |  |  |  |  |
Unpaid milestone payment |  | 4,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Stacked and Active Vessels |  |  |  |  |  |  |  |  |  |  |  |  |
Long Term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-lived asset impairments and other |  | $ 26,700 |  |  |  |  |  |  |  |  |  |  |
Number of vessels stacked | Vessel |  | 61 |  |  |  |  |  |  |  |  |  |  |
Number of vessels sold | Vessel |  | 42 |  |  |  |  |  |  |  |  |  |  |
Number of vessels designated for sale | Vessel |  | 4 |  |  |  |  |  |  |  |  |  | 4 |
Remaining net book value of assets held for sale |  | $ 39,300,000 |  |  |  |  |  |  |  |  |  | $ 39,300,000 |

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