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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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