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Stock Transactions and Unit Redemptions - Schedule of Changes in Shares of Common Stock Outstanding (Detail) - shares | 1 Months Ended | 3 Months Ended
--- | --- | ---
Feb. 28, 2021 | Jan. 31, 2021 | Mar. 31, 2021 | Mar. 31, 2020
Share issuances: |  |  |  |
Other (in shares) |  |  | 0 |
Common Class A |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |
Shares outstanding at beginning of period (in shares) |  | 161,175,894 | 161,175,894 | 156,265,461
Share issuances: |  |  |  |
LPU redemption/exchange (in shares) |  |  | 1,851,802 | 181,872
Other (in shares) |  |  |  | 0
Treasury stock repurchases (in shares) | 0 | 0 | (879,243) | 0
Shares outstanding at end of period (in shares) |  |  | 163,113,922 | 156,701,746
Common Class A | Restricted Stock Units (RSUs) |  |  |  |
Share issuances: |  |  |  |
Issuance of Class A common stock for Newmark RSUs (in shares) |  |  | 965,469 | 254,413

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