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Company's Repurchase Activities (Parenthetical) (Detail) - shares shares in Millions | Feb. 28, 2018 | Jan. 31, 2018
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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

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |