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Revenue Recognition - Additional Information (Detail) - Vessel Mobilization - USD ($) | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Disaggregation of Revenue [Line Items] |  |  |
Deferred costs included within other current assets and other assets |  | $ 4,100,000 | $ 1,600,000
Other Assets |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Deferred costs included within other current assets and other assets |  | $ 800,000 | $ 0
Unsatisfied Performance Obligations | Scenario, Forecast |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Deferred mobilization revenue included within other current liabilities | $ 1,000,000.0 |  |

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