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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 | 60 Months Ended | 67 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 02, 2018 | Sep. 30, 2018 | Aug. 31, 2018 | Jul. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Jan. 31, 2018 | Feb. 28, 2018 | Dec. 31, 2017 | Jul. 30, 2015
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company's common units authorized for repurchase |  |  | 5,550 |  | 3,000 |  |  |  |  |  |  | 2,200 | 5,500 |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 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 |  | 191 | 114 |  | 125 | 430 | 1,089 | 1,281 |  | 2,800 | 5,137 | 2,700 |  |  |
Company's common units authorized for repurchase |  |  | 5,550 |  | 2,900 |  |  |  |  |  |  | 2,200 | 5,500 |  |
Total Common Units remain available for repurchase |  | 5,359 | 5,550 | [1] | 3,005 | 5,359 | 3,130 | 4,219 | [2] | 5,359 | 2,207 |  |  | 2,207 |
Common Stock Available for Repurchase Under Open Market Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company's common units authorized for repurchase |  |  | 3,050 |  |  |  |  |  |  |  |  |  |  |  |
Common Stock Available for Repurchase Under Privately Negotiated Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company's common units authorized for repurchase |  |  | 2,500 |  |  |  |  |  |  |  |  |  |  |  |
[1] | In August 2018, the Board authorized an increase in the number of Common Units available for repurchase from 2.9 million to 5.55 million.
[2] | In February 2018, the Board authorized an increase in the number of Common Units available for repurchase from 2.2 million to 5.5 million.

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