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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 |  |  |  |  |  |  |  |  |  |  |

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