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v3.8.0.1

Condensed Consolidated Statements of Changes in Equity (Parenthetical) - shares | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Forfeitures of restricted Class A common stock, shares | 0 |
Class A Common Stock [Member] |  |
Equity-based compensation, shares | 280,884 | 570,944
Grant of exchangeability and redemption of limited partnership interests, shares | 2,787,190 | 9,179,295
Issuance of Class A common stock (net of costs), shares | 18,925,702 | 1,994,670
Repurchase of Class A common stock, shares | 0 | 1,386,769
Forfeitures of restricted Class A common stock, shares |  | 183,246
Cantor purchase of Cantor units from BGC Holdings upon redemption of founding/working partner units, units |  | 1,179,788
Issuance of Class A common stock for acquisitions, shares | 317,096 |
Partnership Units [Member] | Class A Common Stock [Member] |  |
Redemption of FPUs | 5,403 | 729,802
Smith Mack [Member] | Class A Common Stock [Member] |  |
Issuance of Class A common stock for acquisitions, shares | 317,096 | 1,923,854

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- Definition Number of shares of stock issued during the period pursuant to acquisitions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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