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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 72 Months Ended 85 Months Ended
Jul. 02, 2018
Sep. 30, 2019
Aug. 31, 2019
Jul. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Jul. 31, 2019
Capital Unit [Line Items]                      
Company's common units authorized for repurchase     2,300 1,300             1,300
Fourth 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   1,362 223 147 1,732 885 2,187 599 5,403 7,937 9,500
Company's common units authorized for repurchase     2,300 1,300             1,300
Total Common Units remain available for repurchase   956 [1] 2,318 [2] 1,541 956 [1] 1,688 2,573 [3] 4,760 956 [1] 5,359 1,541
Common Stock Available for Repurchase Under Open Market Transactions                      
Capital Unit [Line Items]                      
Company's common units authorized for repurchase     1,000                
Common Stock Available for Repurchase Under Privately Negotiated Transactions                      
Capital Unit [Line Items]                      
Company's common units authorized for repurchase     1,300                
[1] September 2019 common units repurchased include 1.2 million common units acquired in a private transaction.
[2] In August 2019, the Board authorized an increase in the number of Common Units available for repurchase from 1.3 million to 2.3 million.
[3] Second quarter of fiscal year 2019 common units repurchased include 1.2 million common units acquired in a private transaction.