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Stock Transactions and Unit Redemptions - Additional Information (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2021 USD ($) class vote $ / shares shares | Mar. 31, 2021 $ / shares shares | Jun. 30, 2020 shares | Jun. 30, 2021 USD ($) shares vote class $ / shares | Jun. 30, 2020 shares | Aug. 05, 2021 USD ($) | Feb. 17, 2021 shares | Dec. 31, 2020 $ / shares shares | Mar. 31, 2020 shares | Dec. 31, 2019 shares
Class of Stock |  |  |  |  |  |  |  |  |  |
Number of authorized classes of common stock | class | 2 |  |  | 2 |  |  |  |  |  |
Number of shares authorized to be repurchased (in shares) |  |  |  |  |  |  | 400,000,000.0 |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |
Class of Stock |  |  |  |  |  |  |  |  |  |
Remaining from debt repurchase authorization | $ |  |  |  |  |  | $ 400,000 |  |  |  |
Common Class A |  |  |  |  |  |  |  |  |  |
Class of Stock |  |  |  |  |  |  |  |  |  |
Common stock, votes per share | vote | 1 |  |  | 1 |  |  |  |  |  |
Common stock, shares authorized (in shares) | 1,000,000,000.0 |  |  | 1,000,000,000.0 |  |  |  | 1,000,000,000 |  |
Common stock, par value (in usd per share) | $ / shares | $ 0.01 |  |  | $ 0.01 |  |  |  | $ 0.01 |  |
Common stock, shares outstanding (in shares) | 179,736,458 | 163,113,922 | 157,811,436 | 179,736,458 | 157,811,436 |  |  | 161,175,894 | 156,701,746 | 156,265,461
Treasury stock repurchases (in shares) | 3,613,098 | 879,243 | 0 | 4,492,341 |  |  |  |  |  |
Shares repurchased price (in dollars per share) | $ / shares | $ 12.81 | $ 10.58 |  | $ 12.36 |  |  |  |  |  |
Share repurchase and redemption unit remaining authorized amount | $ | $ 342,365 |  |  | $ 342,365 |  |  |  |  |  |
Common Class B |  |  |  |  |  |  |  |  |  |
Class of Stock |  |  |  |  |  |  |  |  |  |
Common stock, votes per share | vote | 10 |  |  | 10 |  |  |  |  |  |
Common stock, shares authorized (in shares) | 500,000,000 |  |  | 500,000,000 |  |  |  | 500,000,000 |  |
Common stock, par value (in usd per share) | $ / shares | $ 0.01 |  |  | $ 0.01 |  |  |  | $ 0.01 |  |
Conversion of common stock (in shares) |  |  |  | 1 |  |  |  |  |  |
Common stock, shares outstanding (in shares) | 21,285,533 |  |  | 21,285,533 |  |  |  | 21,285,533 |  |

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