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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, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2020
Stock Transactions Parenthetical Disclosures [Abstract] |  |  |  |  |
Redemptions, Number of Units | 720 | 1,481 | 103 | 235 | 2,539
Repurchases, Number of Shares |  | 2 |  |  | 2
Total Number of Units Redeemed or Shares Repurchased |  |  |  |  | 2,541
Redemptions, Weighted Average Price Paid per Unit or Share | $ 1.78 | $ 2.80 | $ 3.05 | $ 4.30 | $ 2.67
Repurchases, Weighted Average Price Paid per Unit or Shares |  | $ 2.58 |  |  | 2.58
Total Redemptions and Repurchases, Weighted Average Price Paid per Unit or Shares |  |  |  |  | $ 2.67
Total Redemptions and Repurchases, Approximate Dollar Value of Units and Shares That May Yet Be Redeemed/Purchased Under the Program | $ 249,908 |  |  |  | $ 249,908

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