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Partnership's Repurchase Activities (Detail) - $ / shares shares in Thousands | 3 Months Ended | 12 Months Ended | 48 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Jun. 30, 2016
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |
Partnership's common units authorized for repurchase |  | 7,344 |  |  |  | 7,344 |  |  |  |
Private Transaction |  |  |  |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |
Partnership's common units authorized for repurchase |  | 2,450 |  |  |  | 2,450 |  |  |  |
Total Number of Units Purchased |  | 1,300 |  |  |  |  |  | 1,150 |  |
Plan III Common Units Repurchase Program |  |  |  |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |
Partnership's common units authorized for repurchase |  | 4,894 |  |  |  | 4,894 |  |  |  |
Total Number of Units Purchased | [2] | 1,300 | [1] | 92 | 3 | 1,395 |  | 3,742 | [3] |
Average Price Paid per Unit | [4] | $ 8.70 | [1] | $ 7.49 | $ 7.02 | $ 8.62 |  | $ 4.72 | [3] |
Maximum Number of Units that May Yet Be Purchased |  | 2,207 | [1] | 2,207 | 2,299 | 2,207 | [1] | 2,302 | [3] | 2,207
[1] | Includes 1.3 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] | Includes 1.15 million common units acquired in a private transaction.
[4] | Amounts include repurchase costs.

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