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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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The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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-Publisher FASB
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