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Company's Repurchase Activities (Detail) - $ / shares shares in Thousands | 72 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2017
Capital Unit [Line Items] |  |  |  |
Company's common units authorized for repurchase |  |  |  | 7,344
Plan III Common Units Repurchase Program |  |  |  |
Capital Unit [Line Items] |  |  |  |
Company's common units authorized for repurchase |  |  |  | 4,894
Total Number of Units Purchased | [1],[2] | 5,137 |  |
Average Price Paid per Unit | [1],[3] | $ 5.78 |  |
Maximum Number of Units that May Yet Be Purchased |  | 2,207 | [1] | 2,207
Private Transaction |  |  |  |
Capital Unit [Line Items] |  |  |  |
Company's common units authorized for repurchase |  | 2,450 |  | 2,450
[1] | Includes 2.45 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] | Amounts include repurchase costs.

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