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Company's Repurchase Activities (Detail) - $ / shares shares in Thousands | 1 Months Ended | 3 Months Ended | 72 Months Ended
--- | --- | --- | ---
Jan. 31, 2019 | Dec. 31, 2018 | Nov. 30, 2018 | Oct. 31, 2018 | Dec. 31, 2018 | Sep. 30, 2018
Repurchase Plan |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |
Total Number of Units Purchased |  |  | 266 | 182 | 151 | 599 | 7,937
Average Price Paid per Unit | [1] |  | $ 9.41 | $ 9.71 | $ 9.70 | $ 9.57 | $ 7.11
Maximum Number of Units that May Yet Be Purchased |  |  | 4,760 | 5,026 | 5,208 | 4,760 | 5,359
Repurchase Plan | Subsequent Event |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |
Total Number of Units Purchased |  | 516 |  |  |  |  |
Average Price Paid per Unit | [1] | $ 9.39 |  |  |  |  |
Maximum Number of Units that May Yet Be Purchased | [2] | 4,244 |  |  |  |  |
Publicly Announced Plans or Programs As Part of Repurchase Plan |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |
Total Number of Units Purchased |  |  | 266 | 182 | 151 | 599 | 5,493
Publicly Announced Plans or Programs As Part of Repurchase Plan | Subsequent Event |  |  |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |  |  |
Total Number of Units Purchased |  | 516 |  |  |  |  |
[1] | Amount includes repurchase costs.
[2] | Of the total available for repurchase, approximately 1.7 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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