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Common Unit Repurchase and Retirement - Company's Repurchase Activities (Parenthetical) (Detail) - shares shares in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 | Jul. 30, 2019 | Sep. 30, 2018
Private Transaction |  |  |
Capital Unit [Line Items] |  |  |
Company's common units repurchased | 1.2 |  |
Common Stock Available for Repurchase Under Open Market Transactions |  |  |
Capital Unit [Line Items] |  |  |
Company's common units authorized for repurchase |  |  | 8.4
Common Stock Available for Repurchase Under Open Market Transactions | Subsequent Event |  |  |
Capital Unit [Line Items] |  |  |
Company's common units authorized for repurchase |  | 0.3 |
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 |  | 1.3 |

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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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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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