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Common Unit Repurchase Plans and Retirement - Additional Information (Detail) - USD ($)
shares in Thousands
1 Months Ended 2 Months Ended 3 Months Ended 12 Months Ended 84 Months Ended 97 Months Ended
Dec. 04, 2019
Nov. 30, 2020
Oct. 31, 2020
Sep. 30, 2020
Aug. 31, 2020
Jul. 31, 2020
Nov. 30, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Jul. 31, 2020
May 31, 2020
Apr. 30, 2020
Feb. 29, 2020
Jan. 31, 2020
Capital Unit [Line Items]                                    
Company's common units authorized for repurchase         6,000 2,000               2,000 3,600 100 1,100 100
Fifth Amendment                                    
Capital Unit [Line Items]                                    
Availability required to repurchase common units $ 45,000,000                                  
Percentage of the maximum facility size on a historical proforma and forward-looking basis 15.00%                                  
Non Seasonal maximum borrowing capacity under revolving credit facility $ 300,000,000                                  
Minimum fixed charge coverage ratio for distributions to unit holders or to repurchase common units 115.00%                                  
Repurchase Plan                                    
Capital Unit [Line Items]                                    
Company's common units repurchased and retired       255 159 725   1,139 1,155 782 1,281 4,357 13,340 14,400        
Repurchase Plan | Subsequent Event                                    
Capital Unit [Line Items]                                    
Company's common units repurchased and retired   1,553 308       500                      
Common Stock Available for Repurchase Under Open Market Transactions                                    
Capital Unit [Line Items]                                    
Company's common units authorized for repurchase         4,900                          
Common Stock Available for Repurchase Under Open Market Transactions | Subsequent Event                                    
Capital Unit [Line Items]                                    
Company's common units authorized for repurchase   4,200         4,200                      
Common Stock Available for Repurchase Under Privately Negotiated Transactions                                    
Capital Unit [Line Items]                                    
Company's common units authorized for repurchase         1,100                          
Common Stock Available for Repurchase Under Privately Negotiated Transactions | Subsequent Event                                    
Capital Unit [Line Items]                                    
Company's common units authorized for repurchase   1,100         1,100                      
Publicly Announced Plans or Programs As Part of Repurchase Plan                                    
Capital Unit [Line Items]                                    
Company's common units repurchased and retired       255 159 725   1,139 1,155 782 650 3,726 10,896          
Publicly Announced Plans or Programs As Part of Repurchase Plan | Subsequent Event                                    
Capital Unit [Line Items]                                    
Company's common units repurchased and retired   153 308       500