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Company's Repurchase Activities (Parenthetical) (Detail) - shares shares in Thousands | Nov. 30, 2018 | Aug. 31, 2018 | Jul. 31, 2018 | Feb. 28, 2018 | Jan. 31, 2018
--- | --- | --- | --- | --- | ---
Capital Unit [Line Items] |  |  |  |  |
Company's common units authorized for repurchase |  | 5,550 | 3,000 | 5,500 | 2,200
Repurchase Plan |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |
Company's common units authorized for repurchase |  | 5,550 | 2,900 | 5,500 | 2,200
Open Market Transactions | Subsequent Event |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |
Company's common units authorized for repurchase | 2,500 |  |  |  |
Privately Negotiated Transactions | Subsequent Event |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |
Company's common units authorized for repurchase | 2,500 |  |  |  |

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- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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