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Stock Transactions and Unit Redemptions - Schedule of Share Repurchase Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 | Feb. 28, 2021 | Jan. 31, 2021 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Class of Stock |  |  |  |  |  |
Shares repurchased (in shares) | 6,337,471 |  |  | 6,337,471 |  | 5,498,228
Common Class A |  |  |  |  |  |
Class of Stock |  |  |  |  |  |
Gross units redeemed (shares) | 28,962 | 0 | 0 |  |  |
Treasury stock repurchases (in shares) |  | 0 | 0 | 879,243 | 0 |
Shares repurchased (in shares) | 908,205 |  |  | 908,205 |  |
Average price of units redeemed (in dollars per share) | $ 11.09 | $ 0 | $ 0 |  |  |
Average price paid per unit or share (in dollars per share) |  | $ 0 | $ 0 | $ 10.57 |  |
Average Price Paid (in dollars per share) |  |  |  | $ 10.59 |  |
Approximate Dollar Value of Units and Shares That May Yet Be Repurchased/ Purchased Under the Program | $ 390,386 |  |  | $ 390,386 |  |

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