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Condensed Consolidated Statements of Changes in Equity - USD ($) $ in Thousands | Total | Commercial Real Estate Consulting Firm [Member] | Smith Mack [Member] | Berkeley Point [Member] | Newmark [Member] | Additional Paid-in Capital [Member] | Additional Paid-in Capital [Member] Smith Mack [Member] | Additional Paid-in Capital [Member] Berkeley Point [Member] | Additional Paid-in Capital [Member] Newmark [Member] | Contingent Class A Common Stock [Member] | Contingent Class A Common Stock [Member] Smith Mack [Member] | Treasury Stock [Member] | Retained Deficit [Member] | Retained Deficit [Member] Berkeley Point [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Noncontrolling Interest in Subsidiaries [Member] | Noncontrolling Interest in Subsidiaries [Member] Commercial Real Estate Consulting Firm [Member] | Noncontrolling Interest in Subsidiaries [Member] Smith Mack [Member] | Noncontrolling Interest in Subsidiaries [Member] Berkeley Point [Member] | Noncontrolling Interest in Subsidiaries [Member] Newmark [Member] | Class A Common Stock [Member] | Class A Common Stock [Member] Smith Mack [Member] | Class B Common Stock [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2016 | $ 1,633,540 |  |  |  |  | $ 1,662,615 |  |  |  | $ 42,472 |  | $ (288,743) | $ (212,858) |  | $ (23,199) | $ 449,980 |  |  |  |  | $ 2,925 |  | $ 348
Consolidated net income (loss) | 81,729 |  |  |  |  |  |  |  |  |  |  |  | 51,475 |  |  | 30,254 |  |  |  |  |  |  |
Other comprehensive gain, net of tax | 14,852 |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,713 | 2,139 |  |  |  |  |  |  |
Equity-based compensation | 2,137 |  |  |  |  | 1,370 |  |  |  |  |  |  |  |  |  | 761 |  |  |  |  | 6 |  |
Dividends to common stockholders | (200,116) |  |  |  |  |  |  |  |  |  |  |  | (200,116) |  |  |  |  |  |  |  |  |  |
Earnings distributions to limited partnership interests and other noncontrolling interests | (118,795) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (118,795) |  |  |  |  |  |  |
Grant of exchangeability and redemption of limited partnership interests | 203,199 |  |  |  |  | 125,502 |  |  |  |  |  |  |  |  |  | 77,605 |  |  |  |  | 92 |  |
Issuance of Class A common stock (net of costs) | 57,721 |  |  |  |  | 45,101 |  |  |  |  |  |  |  |  |  | 12,600 |  |  |  |  | 20 |  |
Redemption of FPUs | (6,665) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (6,665) |  |  |  |  |  |  |
Repurchase of Class A common stock | (16,773) |  |  |  |  |  |  |  |  |  |  | (13,164) |  |  |  | (3,609) |  |  |  |  |  |  |
Forfeitures of restricted Class A common stock | (1,153) |  |  |  |  | 1,063 |  |  |  |  |  | (1,966) |  |  |  | (250) |  |  |  |  |  |  |
Cantor purchase of Cantor units from BGC Holdings upon redemption of founding/working partners units | 3,920 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,920 |  |  |  |  |  |  |
Issuance of Class A common stock for acquisitions |  |  | $ 2,662 |  |  |  | $ 8,037 |  |  |  | $ (5,961) |  |  |  |  |  |  | $ 566 |  |  |  | $ 20 |
Issuance of contingent shares and limited partnership interests in connection with acquisitions | 11,570 |  |  |  |  | 5,121 |  |  |  | 3,961 |  |  |  |  |  | 2,488 |  |  |  |  |  |  |
Acquisition | (89,149) |  |  |  |  |  |  |  |  |  |  |  | (56,483) |  |  | (32,666) |  |  |  |  |  |  |
Noncontrolling Interest Decrease From Business Combination |  |  |  | $ (766,406) |  |  |  | $ (87,434) |  |  |  |  |  | $ (441,386) |  |  |  |  | $ (237,586) |  |  |  |
Noncontrolling Interest, Increase from Business Combination |  |  |  |  | $ 305,420 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 305,420 |  |  |
Purchase of noncontrolling interest |  | $ 18,056 |  |  | (315) |  |  |  | $ (175) |  |  |  |  |  |  |  | $ 18,056 |  |  | (140) |  |  |
Other | 4,307 |  |  |  |  | 2,171 |  |  |  |  |  |  | 359 |  |  | 1,777 |  |  |  |  |  |  |
Ending Balance at Dec. 31, 2017 | 1,139,741 |  |  |  |  | 1,763,371 |  |  |  | 40,472 |  | (303,873) | (859,009) |  | (10,486) | 505,855 |  |  |  |  | 3,063 |  | 348
Consolidated net income (loss) | 97,431 |  |  |  |  |  |  |  |  |  |  |  | 58,774 |  |  | 38,657 |  |  |  |  |  |  |
Other comprehensive gain, net of tax | 4,657 |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,025 | 632 |  |  |  |  |  |  |
Equity-based compensation | 1,292 |  |  |  |  | 836 |  |  |  |  |  |  |  |  |  | 453 |  |  |  |  | 3 |  |
Dividends to common stockholders | (55,576) |  |  |  |  |  |  |  |  |  |  |  | (55,576) |  |  |  |  |  |  |  |  |  |
Earnings distributions to limited partnership interests and other noncontrolling interests | (51,225) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (51,225) |  |  |  |  |  |  |
Grant of exchangeability and redemption of limited partnership interests | 53,933 |  |  |  |  | 35,475 |  |  |  |  |  |  |  |  |  | 18,430 |  |  |  |  | 28 |  |
Issuance of Class A common stock (net of costs) | 231,050 |  |  |  |  | 181,272 |  |  |  |  |  |  |  |  |  | 49,589 |  |  |  |  | 189 |  |
Redemption of FPUs | 171 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 171 |  |  |  |  |  |  |
Issuance of Class A common stock for acquisitions | 4,027 |  |  |  |  | 3,334 |  |  |  | (174) |  |  |  |  |  | 864 |  |  |  |  | 3 |  |
Noncontrolling Interest Decrease From Business Combination |  |  |  |  | (4,897) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (4,897) |  |  |
Purchase of noncontrolling interest |  |  |  |  | $ (100) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (100) |  |  |
Cumulative effect of standard adoption | Revenue [Member] | 18,690 |  |  |  |  |  |  |  |  |  |  |  | 16,387 |  |  | 2,303 |  |  |  |  |  |  |
Cumulative effect of standard adoption | Equity Investments [Member] |  |  |  |  |  |  |  |  |  |  |  |  | 1,671 |  | (2,293) | 622 |  |  |  |  |  |  |
Other | 8 |  |  |  |  | 9 |  |  |  |  |  |  |  |  |  | (1) |  |  |  |  |  |  |
Ending Balance at Mar. 31, 2018 | $ 1,439,202 |  |  |  |  | $ 1,984,297 |  |  |  | $ 40,298 |  | $ (303,873) | $ (837,753) |  | $ (8,754) | $ 561,353 |  |  |  |  | $ 3,286 |  | $ 348

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