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v3.19.3.a.u2

Summary of Common Units Received Under Adjustment Agreement (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Number of Common Units Received | 219,056 |  |  |
Fair Value of Common Units Received | $ 1,552 | $ 1,552 | $ 5,012 | $ 18,363
Annual Common Unit Adjustment |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Date Common Units Received |  | Mar. 31, 2019 | Mar. 29, 2018 | Mar. 31, 2017
Number of Common Units Received |  | 219,056 | 908,042 | 1,487,218
Fair Value of Common Units Received |  | $ 1,552 | $ 5,012 | $ 18,363

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