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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