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Revenue Recognition - Additional Information (Detail) - Vessel Mobilization - USD ($) $ in Millions | Dec. 31, 2019 | Sep. 30, 2019
--- | --- | ---
Disaggregation of Revenue [Line Items] |  |
Deferred costs included within other current assets and other assets |  | $ 3.9
Other Assets |  |
Disaggregation of Revenue [Line Items] |  |
Deferred costs included within other current assets and other assets |  | $ 0.5
Unsatisfied Performance Obligations | Scenario, Forecast |  |
Disaggregation of Revenue [Line Items] |  |
Deferred mobilization revenue included within other current liabilities | $ 0.4 |

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