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Stock Transactions and Unit Redemptions - Schedule of Changes in Shares of Common Stock Outstanding (Detail) - Class A Common Stock [Member] - shares | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2019 | Jun. 30, 2018
Class Of Stock [Line Items] |  |  |
Shares outstanding at beginning of period | 157,422,916 | 156,916,336 | 138,593,787
LPU redemption/exchange | 747,846 | 1,122,776 |
Other issuances of Class A common stock | 70,391 | 78,842 | 327,746
Issuance of Class A common stock for Newmark RSUs | 28,484 | 36,935 |
Newmark treasury stock | (1,613,032) | (1,613,032) |
Shares outstanding at end of period | 156,679,527 | 156,679,527 | 138,921,533
Restricted Stock Units (RSUs) [Member] |  |  |
Class Of Stock [Line Items] |  |  |
Issuance of Class A common stock for Newmark RSUs | 51,406 | 174,605 |

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