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Compensation - Limited Partnership Units with a Post-Termination Payout (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award |  |
Liability balance acquisition related post-termination units | $ 6,800 |
BGC Holdings, L.P. |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
Notional value | 255,356 | $ 257,771
Estimated fair value of the post-termination payout | $ 67,839 | $ 68,682
Outstanding limited partnership units (in shares) | 4,754,973 | 4,873,040
Outstanding limited partnership units - unvested (in dollars per share) | 734,957 | 873,822
NEWMARK Group Inc Parent |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
Outstanding limited partnership units (in shares) | 20,375,058 | 20,184,716
Outstanding limited partnership units - unvested (in dollars per share) | 9,994,672 | 9,778,078

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