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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] $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) $ / shares shares
Business Acquisition [Line Items]
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. | $ / shares	$ 1.75
Weighted average shares outstanding for basic income per share | shares	332,616,301
Diluted income per share:
Net income per share attributable to CBRE Group, Inc. | $ / shares	$ 1.73
Weighted average shares outstanding for diluted income per share | shares	336,414,856

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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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