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Common Unit Repurchase and Retirement - Company's Repurchase Activities (Detail) - $ / shares
shares in Thousands
 1 Months Ended 3 Months Ended 84 Months Ended 94 Months Ended
Jul. 31, 2020
Jun. 30, 2020
May 31, 2020
Apr. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Apr. 30, 2020
Repurchase Plan                  
Capital Unit [Line Items]                  
Total Number of Units Purchased   625 106 424 1,155 782 1,281 13,340 12,800
Average Price Paid per Unit [1]   $ 8.45 $ 8.12 $ 7.71 $ 8.15 $ 8.33 $ 9.42 $ 8.08  
Maximum Number of Units that May Yet Be Purchased   2,869 3,494 [2] 100 2,869 524 [3] 306 [4] 956 100
Publicly Announced Plans or Programs As Part of Repurchase Plan                  
Capital Unit [Line Items]                  
Total Number of Units Purchased   625 106 424 1,155 782 650 10,896  
Subsequent Event | Repurchase Plan                  
Capital Unit [Line Items]                  
Total Number of Units Purchased 725                
Average Price Paid per Unit [1] $ 8.97                
Maximum Number of Units that May Yet Be Purchased [5] 2,144                
Subsequent Event | Publicly Announced Plans or Programs As Part of Repurchase Plan                  
Capital Unit [Line Items]                  
Total Number of Units Purchased 725                
[1] Amount includes repurchase costs.
[2] In May 2020, the Board authorized an increase in the number of Common Units available for repurchase from 0.1 million to 3.6 million.
[3] In February 2020, the Board authorized an increase in the number of Common Units available for repurchase from 0.1 million to 1.1 million.
[4] First quarter of fiscal year 2020 Common Units repurchased include 0.6 million Common Units acquired in a private transaction.
[5] Of the total available for repurchase, approximately 1.0 million units are available for repurchase in open market transactions and 1.1 million units are available for repurchase in privately-negotiated transactions, under the Repurchase Plan.