XML 115 R99.htm IDEA: XBRL DOCUMENT
v3.20.2

Compensation - Compensation Expense Related to Restricted Stock Unit Held by BGC Employees (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Compensation Related Costs [Abstract] |  |  |  |
RSU amortization | $ 3,273 | $ 2,696 | $ 4,855 | $ 3,710

X
- Definition Share based compensation arrangement by share based payment award restricted stock units amortization. + References No definition available. + Details
Name: | bgcp_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockUnitsAmortization
Namespace Prefix: | bgcp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_CompensationRelatedCostsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration