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Company's Repurchase Activities (Detail) - $ / shares shares in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended | 60 Months Ended | 67 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Nov. 30, 2018 | Oct. 31, 2018 | Sep. 30, 2018 | Aug. 31, 2018 | Jul. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Jan. 31, 2018 | Dec. 31, 2017
Repurchase Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Number of Units Purchased |  |  |  |  | 191 | 114 |  | 125 | 430 | 1,089 | 1,281 |  | 2,800 | 5,137 | 2,700 |
Average Price Paid per Unit | [1] |  |  |  | $ 9.73 | $ 9.68 |  | $ 9.72 | $ 9.72 | $ 9.66 | $ 9.38 |  | $ 9.54 | $ 5.78 |  |
Maximum Number of Units that May Yet Be Purchased |  |  |  |  | 5,359 | 5,550 | [2] | 3,005 | 5,359 | 3,130 | 4,219 | [3] | 5,359 | 2,207 |  | 2,207
Repurchase Plan | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Number of Units Purchased |  | 182 |  | 151 |  |  |  |  |  |  |  |  |  |  |  |
Average Price Paid per Unit | [1] | $ 9.71 |  | $ 9.70 |  |  |  |  |  |  |  |  |  |  |  |
Maximum Number of Units that May Yet Be Purchased |  | 5,026 | [4] | 5,208 |  |  |  |  |  |  |  |  |  |  |  |
Publicly Announced Plans or Programs As Part of Repurchase Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Number of Units Purchased |  |  |  |  | 191 | 114 |  | 125 | 430 | 1,089 | 1,281 |  | 2,800 | 2,693 |  |
Publicly Announced Plans or Programs As Part of Repurchase Plan | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Number of Units Purchased |  | 182 |  | 151 |  |  |  |  |  |  |  |  |  |  |  |
[1] | Amounts include repurchase costs.
[2] | In August 2018, the Board authorized an increase in the number of Common Units available for repurchase from 2.9 million to 5.55 million.
[3] | In February 2018, the Board authorized an increase in the number of Common Units available for repurchase from 2.2 million to 5.5 million.
[4] | Of the total available for repurchase, approximately 2.5 million are available for repurchase in open market transactions and 2.5 million are available for repurchase in privately-negotiated transactions.

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