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Compensation - Activity Associated with Limited Partnership Units (Detail) - shares | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
NEWMARK Group Inc Parent |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding |  |
Beginning balance (in shares) | 66,626,185 | 60,800,852
Number of Units, Issued (in shares) | 1,115,181 | 12,569,298
Number of units, Redeemed/exchanged units (in shares) | (3,450,288) | (6,660,984)
Number of Units, Forfeited units (in shares) | (158,167) | (82,981)
Ending balance (in shares) | 64,132,911 | 66,626,185
Exchangeable Units (units) | 9,464,391 | 9,906,763
BGC Holdings, L.P. |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding |  |
Beginning balance (in shares) | 54,422,002 | 56,053,701
Number of Units, Issued (in shares) | 159,057 | 1,071,612
Number of units, Redeemed/exchanged units (in shares) | (1,989,419) | (2,657,901)
Number of Units, Forfeited units (in shares) | (848,335) | (45,410)
Ending balance (in shares) | 51,743,305 | 54,422,002
Exchangeable Units (units) | 23,387,428 | 24,863,107
Regular units | NEWMARK Group Inc Parent |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding |  |
Ending balance (in shares) | 59,897,905 |
Regular units | BGC Holdings, L.P. |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding |  |
Ending balance (in shares) | 50,291,393 |
Preferred Units | NEWMARK Group Inc Parent |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding |  |
Ending balance (in shares) | 4,235,006 |
Preferred Units | BGC Holdings, L.P. |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding |  |
Ending balance (in shares) | 1,451,912 |

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- Definition Exchangeable Units + References No definition available. + Details
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- Definition Number of exchangeable limited partnership units redeemed or exchanged into the Company's class A common stock during the period. + References No definition available. + Details
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- Definition Number of shares under non-option equity instrument agreements that were cancelled as a result of occurrence of a terminating event. + References 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)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Net number of non-option equity instruments granted to participants. + References 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)(iv)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of equity instruments other than options outstanding, including both vested and non-vested instruments. + References 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 http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: 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)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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