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Company's Repurchase Activities (Parenthetical) (Detail) - shares shares in Millions | Jul. 31, 2018 | Feb. 28, 2018 | Jan. 31, 2018
--- | --- | --- | ---
Capital Unit [Line Items] |  |  |
Company's common units authorized for repurchase |  | 5.5 | 2.2
Plan III Common Units Repurchase Program |  |  |
Capital Unit [Line Items] |  |  |
Company's common units authorized for repurchase |  | 5.5 | 2.2
Common Stock Available for Repurchase Under Open Market Transactions |  |  |
Capital Unit [Line Items] |  |  |
Company's common units authorized for repurchase |  | 3.0 |
Common Stock Available for Repurchase Under Open Market Transactions | Subsequent Event |  |  |
Capital Unit [Line Items] |  |  |
Company's common units authorized for repurchase | 0.5 |  |
Common Stock Available for Repurchase Under Privately Negotiated Transactions |  |  |
Capital Unit [Line Items] |  |  |
Company's common units authorized for repurchase |  | 2.5 |
Common Stock Available for Repurchase Under Privately Negotiated Transactions | Subsequent Event |  |  |
Capital Unit [Line Items] |  |  |
Company's common units authorized for repurchase | 2.5 |  |

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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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