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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2015
Business Acquisition [Line Items] |  |
Revenue | $ 3,136,506 | $ 6,062,009
Operating income | 237,646 | 409,049
Net income attributable to CBRE Group, Inc. | $ 125,896 | $ 220,665
Basic income per share: |  |
Net income per share attributable to CBRE Group, Inc. | $ 0.38 | $ 0.66
Weighted average shares outstanding for basic income per share | 331,999,935 | 331,988,489
Diluted income per share: |  |
Net income per share attributable to CBRE Group, Inc. | $ 0.37 | $ 0.66
Weighted average shares outstanding for diluted income per share | 336,154,524 | 335,926,626

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