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Common Unit Repurchase Plans and Retirement - Company's Repurchase Activities (Detail) - $ / shares
shares in Thousands
 1 Months Ended 2 Months Ended 3 Months Ended 12 Months Ended 108 Months Ended 122 Months Ended
Aug. 31, 2022
Nov. 30, 2022
Oct. 31, 2022
Sep. 30, 2022
Aug. 31, 2022
Jul. 31, 2022
Nov. 30, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2022
Sep. 30, 2021
Aug. 31, 2022
Repurchase Plan                            
Capital Unit [Line Items]                            
Total Number of Units Purchased       129 116 126   371 487 992 1,104 2,954 21,979 19,900
Average Price Paid per Unit [1] $ 9.78     $ 8.89   $ 9.73   $ 9.46 $ 10.52 $ 10.50 $ 10.65 $ 10.43 $ 8.60  
Maximum Number of Units that May Yet Be Purchased 1,686 [2]     1,557 1,686 [2] 552   1,557 678 1,165 2,157 [3] 1,557 2,848 1,686 [2]
Repurchase Plan | Subsequent Event                            
Capital Unit [Line Items]                            
Total Number of Units Purchased   167 154       300              
Average Price Paid per Unit   $ 8.71 [1] $ 8.45 [1]       $ 8.59              
Maximum Number of Units that May Yet Be Purchased   1,236 [4] 1,403       1,236 [4]              
Publicly Announced Plans or Programs As Part of Repurchase Plan                            
Capital Unit [Line Items]                            
Total Number of Units Purchased 116     129   126   371 487 992 691 2,541 17,504  
Publicly Announced Plans or Programs As Part of Repurchase Plan | Subsequent Event                            
Capital Unit [Line Items]                            
Total Number of Units Purchased   167 154                      
[1] Amounts include repurchase costs.
[2] In August 2022, the Board authorized an increase in the number of Common Units available for repurchase in open market transactions from 0.2 million to 1.4 million.
[3] On December 30, 2021, the Company purchased 0.4 million Common Units in a private transaction for aggregate consideration of approximately $4.4 million. The approved purchase was made outside of the Company’s unit repurchase plan.
[4] Of the total available for repurchase, approximately 1.0 million are available for repurchase in open market transactions and 0.3 million are available for repurchase in privately-negotiated transactions.