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Common Unit Repurchase Plans and Retirement - Additional Information (Detail) (USD $) In Millions, except Share data in Thousands, unless otherwise specified |  | 0 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Jan. 14, 2014 Second Amendment | Sep. 30, 2014 Second Amendment | Jan. 14, 2014 Second Amendment | Jul. 31, 2012 Initial Common Units Authorized Plan III Common Units Repurchase Program | Jul. 31, 2013 Additional Common Units Authorized Plan III Common Units Repurchase Program
Capital Unit [Line Items] |  |  |  |  |  |
Partnership's common units authorized for repurchase | 6,044 |  |  |  | 3,000 | 1,900
Availability required to repurchase common units |  | $ 45 | $ 45 |  |  |
Percentage of the maximum facility size on a historical proforma and forward-looking basis |  | 15.00% | 15.00% |  |  |
Non Seasonal maximum borrowing capacity under revolving credit facility |  |  | $ 300 | $ 300 |  |
Minimum fixed charge coverage ratio for distributions to unit holders or to repurchase common units |  | 115.00% | 115.00% |  |  |

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- Definition Availability required to pay distributions or repurchase common units. + References No definition available. + Details
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- Definition Minimum Fixed Charge Coverage Ratio For Distributions To Unitholders Or Repurchase Common Units + References No definition available. + Details
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- Definition Minimum percentage of borrowing capacity to pay any distributions to unitholders or repurchase common units. + References No definition available. + Details
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- Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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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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