Annual report pursuant to Section 13 and 15(d)

Summary of Common Units Received Under Adjustment Agreement (Detail)

v3.20.4
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