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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, shares in Thousands, $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | May 31, 2021 | Apr. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2021
Stock Transactions, Parenthetical Disclosures [Abstract] |  |  |  |  |  |
Redemptions (in shares) |  |  |  | 4,715 | 20 | 4,735
Repurchases (in shares) | 15,522 | 1,018 | 2 |  | 965 | 17,507
Total Redemptions and Repurchases (in shares) |  |  |  |  |  | 22,242
Redemptions, Weighted Average Price Paid per Unit or Share (in dollars per share) |  |  |  | $ 5.82 | $ 4.40 | $ 5.82
Repurchases, Weighted Average Price Paid per Unit or Shares (in dollars per share) | $ 6.29 | $ 5.59 | $ 5.29 |  | $ 4.56 | 6.16
Total Redemptions and Repurchases, Weighted Average Price Paid per Unit or Shares (in dollars per share) |  |  |  |  |  | $ 6.08
Total Redemptions and Repurchases, Approximate Dollar Value of Units and Shares That May Yet Be Redeemed/Purchased Under the Program | $ 114,584 |  |  | $ 114,584 |  | $ 114,584

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