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Common Unit Repurchase and Retirement - Additional Information (Detail) - USD ($) shares in Thousands |  | 1 Months Ended | 3 Months Ended | 72 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 02, 2018 | Dec. 31, 2018 | Nov. 30, 2018 | Oct. 31, 2018 | Dec. 31, 2018 | Sep. 30, 2018 | Jul. 30, 2015
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 |  | 266 | 182 | 151 | 599 | 7,937 |
Company's common units authorized for repurchase |  |  |  |  |  | 10,900 |
Total Common Units remain available for repurchase |  | 4,760 | 5,026 | 5,208 | 4,760 | 5,359 |
Common Stock Available for Repurchase Under Open Market Transactions |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |
Company's common units authorized for repurchase |  |  |  |  |  | 8,400 |
Common Stock Available for Repurchase Under Privately Negotiated Transactions |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |
Company's common units authorized for repurchase |  |  |  |  |  | 2,500 |
Common Stock Repurchase Under Open Market Transactions |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |
Company's common units repurchased and retired |  |  |  |  | 6,100 |  |

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