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Common Unit Repurchase Plans and Retirement - Additional Information (Detail) - USD ($) shares in Thousands | Jul. 30, 2015 | Sep. 30, 2017 | Jul. 31, 2013 | Jul. 31, 2012
--- | --- | --- | --- | ---
Capital Unit [Line Items] |  |  |  |
Company's common units authorized for repurchase |  | 7,344 |  |
Third 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% |  |  |
Initial Common Units Authorized Plan III Common Units Repurchase Program |  |  |  |
Capital Unit [Line Items] |  |  |  |
Company's common units authorized for repurchase |  |  |  | 3,000
Additional Common Units Authorized Plan III Common Units Repurchase Program |  |  |  |
Capital Unit [Line Items] |  |  |  |
Company's common units authorized for repurchase |  |  | 1,900 |

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