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Acquisition of Global Workplace Solutions (GWS) (Tables) | 12 Months Ended
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Dec. 31, 2017
Business Combinations [Abstract] |
Summary of Pro Forma Results Prepared for Comparative Purposes | These pro forma results have been prepared for comparative purposes only and do not purport to be indicative of what operating results would have been had the GWS Acquisition occurred on January 1, 2015 and may not be indicative of future operating results (dollars in thousands, except share data):
|  |  | 2015 |
Revenue |  | $ | 12,972,810 |
Operating income |  | $ | 902,612 |
Net income attributable to CBRE Group, Inc. |  | $ | 580,928 |
Basic income per share: |  |  |  |
Net income per share attributable to CBRE Group, Inc. |  | $ | 1.75 |
Weighted average shares outstanding for basic income per share |  |  | 332,616,301 |
Diluted income per share: |  |  |  |
Net income per share attributable to CBRE Group, Inc. |  | $ | 1.73 |
Weighted average shares outstanding for diluted income per share |  |  | 336,414,856 |

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