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Compensation - Summary of the BGC Holdings and Newmark Holdings LPUs held by BGC Employees (Detail) - LPUs - shares	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of units, balance outstanding (in shares)	110,348,000	112,115,000	137,652,000	102,407,000
Newmark
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of units, balance outstanding (in shares)	9,351,000	11,051,000	13,202,000	14,607,000
Regular Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of units, balance outstanding (in shares)	77,777,000
Regular Units | Newmark
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of units, balance outstanding (in shares)	7,153,000
Preferred Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of units, balance outstanding (in shares)	32,571,000
Preferred Units | Newmark
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of units, balance outstanding (in shares)	2,198,000

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- Definition

Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(ii)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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