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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
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Mar. 31, 2018 | Mar. 31, 2017
Fully diluted earnings per share |  |  |
Net income available to common stockholders |  | $ 19,997 | $ 36,711
Allocations of net income to limited partnership interests in BGC Holdings and Newmark Holdings, net of tax |  | 10,289 |
Net income for fully diluted shares |  | $ 30,286 |
Weighted-average shares: |  |  |
Basic weighted-average shares of common stock outstanding |  | 155,694 |
Partnership units | [1] | 90,222 |
Other |  | 918 |
Fully diluted weighted-average shares of common stock outstanding |  | 246,834 |
Fully diluted earnings (loss) per share |  | $ 0.12 |
[1] | Partnership units collectively include founding/working partner units, limited partnership units, and Cantor units (see Note 2—Limited Partnership Interest in Newmark Holdings for more information).

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