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Organization and Basis of Presentation - Additional Information (Detail) $ in Thousands |  | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 30, 2018 shares | Jun. 30, 2020 USD ($) shares | Jan. 01, 2020 USD ($) | Dec. 31, 2019 USD ($) shares | Jan. 01, 2019 USD ($) | Jan. 01, 2018 USD ($)
Description Of Business [Line Items] |  |  |  |  |  |
Retained deficit |  | $ (1,253,434) |  | $ (1,241,754) |  |
Accumulated other comprehensive income (loss) |  | (46,570) |  | (33,102) |  |
Noncontrolling interest in subsidiaries |  | 64,920 |  | 57,911 |  |
Operating lease, right-of-use asset |  | 160,333 |  | 169,065 |  |
Operating lease, liability |  | 180,908 |  | $ 187,398 |  |
ASU No. 2018-03 [Member] |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |
Retained deficit |  |  |  |  |  | $ 2,100
Accumulated other comprehensive income (loss) |  |  |  |  |  | 2,900
Noncontrolling interest in subsidiaries |  |  |  |  |  | 800
ASU No. 2018-03 [Member] | Retained Deficit [Member] | Revision of Prior Period, Change in Accounting Principle, Adjustment [Member] |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |
Tax effect impact for increase or decrease to the liability |  |  |  |  |  | 400
ASU No. 2018-03 [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Revision of Prior Period, Change in Accounting Principle, Adjustment [Member] |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |
Tax effect impact for increase or decrease to the liability |  |  |  |  |  | 600
ASU No. 2018-03 [Member] | Noncontrolling Interest in Subsidiaries [Member] | Revision of Prior Period, Change in Accounting Principle, Adjustment [Member] |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |
Tax effect impact for increase or decrease to the liability |  |  |  |  |  | $ 200
ASU No. 2016-02 [Member] |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |
Operating lease, right-of-use asset |  |  |  |  | $ 192,400 |
Operating lease, liability |  |  |  |  | $ 206,000 |
ASU No. 2016-13 [Member] | Revision of Prior Period, Change in Accounting Principle, Adjustment [Member] | Assets [Member] |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |
Tax effect impact for increase or decrease to the liability |  | 600 | $ 1,900 |  |  |
ASU No. 2016-13 [Member] | Retained Deficit [Member] | Revision of Prior Period, Change in Accounting Principle, Adjustment [Member] |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |
Tax effect impact for increase or decrease to the liability |  | 400 | 1,300 |  |  |
ASU No. 2016-13 [Member] | Noncontrolling Interest in Subsidiaries [Member] | Revision of Prior Period, Change in Accounting Principle, Adjustment [Member] |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |
Tax effect impact for increase or decrease to the liability |  | $ 200 | $ 600 |  |  |
BGC Holdings Partnership Unit [Member] |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |
Exchangeable limited partnership units | shares | 1,458,931 |  |  |  |  |
Class A Common Stock [Member] |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |
Common stock, shares issued | shares |  | 363,848,000 |  | 358,440,000 |  |
Class B Common Stock [Member] |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |
Common stock, shares issued | shares |  | 45,884,000 |  | 45,884,000 |  |
Newmark [Member] |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |
Percentage of voting power | 94.00% |  |  |  |  |
Percentage of economics of outstanding common stock | 87.00% |  |  |  |  |
Newmark [Member] | Class A Common Stock [Member] |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |
Stockholders received on per share | 0.463895 |  |  |  |  |
Common stock, shares issued | shares | 131,886,409 |  |  |  |  |
Newmark [Member] | Class A Common Stock [Member] | Cantor and CFGM [Member] |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |
Common stock, shares issued | shares | 449,917 |  |  |  |  |
Newmark [Member] | Class B Common Stock [Member] |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |
Stockholders received on per share | 0.463895 |  |  |  |  |
Common stock, shares issued | shares | 21,285,537 |  |  |  |  |
Exchange Ratio | 0.9366 | 0.9366 |  |  |  |

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