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v3.20.1

Long-Term Debt - Additional Information - Senior Unsecured Notes (Detail) $ in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 27, 2010 USD ($) | May 31, 2019 USD ($) | Nov. 30, 2015 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2019 vessel | Dec. 31, 2018 USD ($) | Dec. 31, 2014 USD ($)
Senior Notes (8.5%) due January 15, 2020 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate |  |  | 8.50% |  | 8.50% | 8.50% |
Debt instrument, principal amount | $ 450.0 |  | $ 200.0 |  |  |  |
Percentage over par at which notes sold | 99.20% |  | 99.01% |  |  |  |
Effective interest rate |  |  |  |  | 8.67% |  |
Repayments of senior debt |  | $ 460.9 |  | $ 10.9 |  | $ 84.1 | $ 57.3
Debt Instrument, Redemption Price, Percentage |  |  |  |  | 100.00% |  |
US Treasury (UST) Interest Rate [Member] | Senior Notes Due 2020 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument spread on variable rate |  |  |  |  | 5000.00% |  |
US Treasury (UST) Interest Rate [Member] | Senior Notes (8.5%) due January 15, 2020 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument spread on variable rate |  |  |  |  | 5000.00% |  |
FPSO | Asset Pledged as Collateral [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Number of vessels | vessel |  |  |  |  | 3 |  |

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