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Summary of Common Units Received Under Adjustment Agreement (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Schedule Of Equity Method Investments [Line Items] |  |  |
Fair Value of Common Units Received | $ 5,012 | $ 18,363 | $ 11,111
Annual Common Unit Adjustment |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |
Date Common Units Received | Mar. 29, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Number of Common Units Received | 908,042 | 1,487,218 | 753,598
Fair Value of Common Units Received | $ 5,012 | $ 18,363 | $ 11,111

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