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Acquisition of Global Workplace Solutions (GWS) - Summary of Pro Forma Results Prepared for Comparative Purposes (Detail) - Global Workplace Solutions (GWS) [Member] - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2015
Business Acquisition [Line Items] |  |
Revenue | $ 3,210,559 | $ 9,272,568
Operating income | 258,417 | 665,453
Net income attributable to CBRE Group, Inc. | $ 156,597 | $ 372,285
Basic income per share: |  |
Net income per share attributable to CBRE Group, Inc. | $ 0.47 | $ 1.12
Weighted average shares outstanding for basic income per share | 332,684,487 | 332,223,036
Diluted income per share: |  |
Net income per share attributable to CBRE Group, Inc. | $ 0.47 | $ 1.11
Weighted average shares outstanding for diluted income per share | 336,561,877 | 336,140,923

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