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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 | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2021
Equity [Abstract] |  |  |  |  |
Redemptions (in shares) | 38 | 73 | 4,715 | 20 | 4,846
Repurchases (in shares) | 26,313 | 24,433 | 16,542 | 965 | 68,253
Total Redemptions and Repurchases (in shares) |  |  |  |  | 73,099
Redemptions, Weighted Average Price Paid per Unit or Share (in dollars per share) | $ 5.37 | $ 5.14 | $ 5.82 | $ 4.40 | $ 5.80
Repurchases, Weighted Average Price Paid per Unit or Shares (in dollars per share) | $ 4.97 | $ 5.19 | $ 6.25 | $ 4.56 | 5.35
Total Redemptions and Repurchases, Weighted Average Price Paid per Unit or Shares (in dollars per share) |  |  |  |  | $ 5.38
Approximate Dollar Value of Units and Shares That May Yet Be Redeemed/ Purchased Under the Program | $ 191,809 |  |  |  | $ 191,809

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