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Common Unit Repurchase Plans and Retirement - Additional Information (Detail) - USD ($)
shares in Thousands
1 Months Ended 3 Months Ended 12 Months Ended 96 Months Ended 97 Months Ended
Dec. 04, 2019
Sep. 30, 2021
Aug. 31, 2021
Jul. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Jul. 31, 2020
Aug. 31, 2020
Capital Unit [Line Items]                        
Company's common units authorized for repurchase                     2,000 6,000
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   337 223 25 585 568 538 2,591 4,282 17,697 14,400  
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 Open Market Transactions                        
Capital Unit [Line Items]                        
Company's common units authorized for repurchase                       4,900