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Earnings Per Share and Weighted-Average Shares Outstanding - Calculation of Fully Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Fully diluted earnings per share: |  |  |  |  |
Net income available to common stockholders | [1] | $ 435,178 | $ (2,131) | $ 466,642 | $ 3,604
Allocations of net income to limited partnership interests in Newmark Holdings, net of tax |  | 148,567 | 0 | 159,830 | 0
Net income for fully diluted shares |  | $ 583,745 | $ (2,131) | $ 626,472 | $ 3,604
Weighted-average shares: |  |  |  |  |
Common stock outstanding (in shares) |  | 185,114 | 178,523 | 184,190 | 178,034
Cantor units (units) |  | 23,679 | 0 | 23,704 | 0
Partnership units (units) |  | 59,443 | 0 | 59,632 | 0
RSUs (Treasury stock method) (units) |  | 4,149 | 0 | 3,582 | 442
Newmark exchange shares ( in shares) |  | 1,170 | 0 | 1,195 | 234
Fully diluted weighted-average shares of common stock outstanding (in shares) |  | 273,555 | 178,523 | 272,303 | 178,710
Fully diluted earnings per share (in usd per share) |  | $ 2.13 | $ (0.01) | $ 2.30 | $ 0.02
[1] | Includes a reduction for dividends on preferred stock or EPUs in the amount of $4.6 million and $6.2 million for the three and six months ended June 30, 2021, respectively, and $2.4 million and $4.9 million for the three and six months ended June 30, 2020, respectively. (see Note 1 — “Organization and Basis of Presentation”).

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