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Stock Transactions and Unit Redemptions - Schedule of Share Repurchase Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Class of Stock |  |  |  |  |  |
Shares repurchased (in shares) | 10,029,425 |  |  | 10,029,425 |  | 5,498,228
Common Class A |  |  |  |  |  |
Class of Stock |  |  |  |  |  |
Gross units redeemed (shares) | 167,894 | 0 |  | 167,894 |  |
Treasury stock repurchases (in shares) | 3,613,098 | 879,243 | 0 | 4,492,341 |  |
Shares repurchased (in shares) | 4,660,235 |  |  | 4,660,235 |  |
Average price of units redeemed (in dollars per share) | $ 11.91 | $ 0 |  | $ 11.91 |  |
Average price paid per unit or share (in dollars per share) | $ 12.81 | $ 10.58 |  | 12.36 |  |
Average Price Paid (in dollars per share) |  |  |  | $ 12.34 |  |
Approximate Dollar Value of Units and Shares That May Yet Be Repurchased/ Purchased Under the Program | $ 342,365 |  |  | $ 342,365 |  |

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