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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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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
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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