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Other Debt - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2020
Debt Instrument [Line Items] |  |
Trade payable, interest bearing interest rate |  | 12.00%
Trade payable in accounts payable |  | $ 700,000
Collateral asset carrying value |  | $ 0
Magellan Offshore Services Ltd [Member] | Marine Equipment [Member] |  |
Debt Instrument [Line Items] |  |
Proceeds from sale of marine equipment | $ 1,000,000 |
Contingent liability | $ 500,000 |
Collateral Agreement [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument maturity date |  | Aug. 31, 2018

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