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Summary of Common Units Received Under Adjustment Agreement (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 29, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |
Number of Common Units Received | 1,112,368 |  |  |  |  |
Fair Value of Common Units Received | $ 3,620 |  |  | $ 3,620 | $ 1,552 | $ 5,012
Annual Common Unit Adjustment |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |
Date Common Units Received | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 29, 2018 |  |  |
Number of Common Units Received | 1,112,368 | 219,056 | 908,042 |  |  |
Fair Value of Common Units Received | $ 3,620 | $ 1,552 | $ 5,012 |  |  |

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