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Stock Transactions and Unit Redemptions - Schedule of Changes in Shares of Common Stock Outstanding (Detail) - shares | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Share issuances: |  |  |  |  |
Other (in shares) | 18,817,132 |  |  | 18,817,132 |
Common Class A |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Shares outstanding at beginning of period (in shares) | 163,113,922 | 161,175,894 | 156,701,746 | 161,175,894 | 156,265,461
Share issuances: |  |  |  |  |
LPU redemption/exchange (in shares) | 1,140,363 |  | 827,847 | 2,992,165 | 1,009,719
Other (in shares) |  |  | 0 |  | 0
Treasury stock repurchases (in shares) | (3,613,098) | (879,243) | 0 | (4,492,341) |
Shares outstanding at end of period (in shares) | 179,736,458 | 163,113,922 | 157,811,436 | 179,736,458 | 157,811,436
Common Class A | Restricted Stock Units (RSUs) |  |  |  |  |
Share issuances: |  |  |  |  |
Issuance of Class A common stock for Newmark RSUs (in shares) | 278,139 |  | 281,843 | 1,243,608 | 536,256

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