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Stock Transactions and Unit Redemptions - Gross Unit Redemptions and Share Repurchases of Class A Common Stock (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2020 | Jun. 30, 2019
Stock Transactions Parenthetical Disclosures [Abstract] |  |  |  |
Redemptions, Number of Units | 103,000 | 235,000 | 338,000 |
Repurchases, Number of Shares |  |  |  | 233,172
Total Number of Units Redeemed or Shares Repurchased |  |  | 338,000 |
Redemptions, Weighted Average Price Paid per Unit or Share | $ 3.05 | $ 4.30 | $ 3.92 |
Total Redemptions and Repurchases, Weighted Average Price Paid per Unit or Shares |  |  | $ 3.92 |
Total Redemptions and Repurchases, Approximate Dollar Value of Units and Shares That May Yet Be Redeemed/Purchased Under the Program | $ 255,365 |  | $ 255,365 |

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