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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 | 1 Months Ended | 3 Months Ended | 6 Months Ended
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Jun. 30, 2022 | May 31, 2022 | Apr. 30, 2022 | Jun. 30, 2021 | May 31, 2021 | Apr. 30, 2021 | Jun. 30, 2022 | Mar. 31, 2022 | Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Stock Transactions, Parenthetical Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Redemptions (in shares) |  |  |  |  |  |  | 1,010,000 | 43,000 | 4,715,000 | 20,000 | 1,053,000 | 4,735,000
Repurchases (in shares) | 7,595 | 1,150 | 0 | 15,522,000 | 1,018,000 | 2,000 |  | 0 |  | 965,000 |  |
Repurchase of class A common stock (in shares) |  |  |  |  |  |  | 8,745,000 |  | 16,543,000 |  | 8,745,000 | 17,507,000
Total redemptions and repurchases (in shares) |  |  |  |  |  |  |  |  |  |  | 9,798,000 | 22,242,000
Redemptions, weighted average price paid per unit or share (in dollars per share) |  |  |  |  |  |  | $ 3.81 | $ 4.01 | $ 5.82 | $ 4.40 | $ 3.82 | $ 5.82
Repurchases, weighted average price paid per unit or shares (in dollars per share) | $ 3.31 | $ 3.70 | $ 0 | $ 6.29 | $ 5.59 | $ 5.29 |  | $ 0 |  | $ 4.56 | 3.36 | 6.16
Total redemptions and repurchases, weighted average price paid per unit or shares (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 3.41 | $ 6.08
Approximate Dollar Value of Units and Shares That May Yet Be Redeemed/ Purchased Under the Program | $ 158,404 |  |  | $ 114,584 |  |  | $ 158,404 |  | $ 114,584 |  | $ 158,404 | $ 114,584

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