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Partnership's Repurchase Activities (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Aug. 31, 2014 | Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012 | Jul. 31, 2014 | Jun. 30, 2014 | Mar. 31, 2014
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partnership's common units authorized for repurchase | 6,044 |  |  |  | 6,044 |  |  |  | 6,044 |  |  |  |  |  |  |  |
Private Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partnership's common units authorized for repurchase | 1,150 | [1] |  |  | 1,150 | [1] |  |  | 1,150 | [1] | 1,150 |  |  |  |  |  |
Plan III Common Units Repurchase Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partnership's common units authorized for repurchase | 4,894 |  |  |  | 4,894 |  |  |  | 4,894 |  |  |  |  |  |  |  |
Total Number of Units Purchased | 54 | [2] | 9 | [2] | 63 | [2] | 250 | [2],[3] | 313 | [2] | 3,284 | [1],[2] | 22 | [2] |  |  |
Average Price Paid per Unit | $ 5.78 | [4] | $ 5.76 | [4] | $ 5.77 | [4] | $ 5.20 | [3],[4] | $ 5.32 | [4] | $ 4.63 | [1],[4] | $ 4.26 | [4] |  |  |
Maximum Number of Units that May Yet Be Purchased | 2,425 |  | 2,479 |  | 2,425 |  | 2,488 | [3] | 2,425 |  | 2,738 | [1] | 6,022 |  | 2,488 | 2,488 | 2,488
[1] | Fiscal year 2013 common unit repurchases include 1.15 million common units acquired in a private transaction.
[2] | Units were repurchased as part of a publicly announced program, except as noted in a private transaction.
[3] | First quarter fiscal year 2014 common unit repurchases were acquired in a private transaction.
[4] | Amounts include repurchase costs.

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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 The remaining 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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