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FacilitySource Acquisition - Summary of Pro Forma Results Prepared for Comparative Purposes (Detail) - FacilitySource [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Business Acquisition [Line Items]
Revenue	$ 5,260,954	$ 4,675,977	$ 15,143,266	$ 13,421,277
Operating income	194,155	231,975	623,771	651,553
Net income attributable to CBRE Group, Inc.	$ 293,726	$ 193,666	$ 663,247	$ 521,621
Basic income per share:
Net income per share attributable to CBRE Group, Inc.	$ 0.87	$ 0.57	$ 1.96	$ 1.55
Weighted average shares outstanding for basic income per share	339,477,316	337,948,324	339,151,807	337,280,914
Diluted income per share:
Net income per share attributable to CBRE Group, Inc.	$ 0.85	$ 0.57	$ 1.93	$ 1.53
Weighted average shares outstanding for diluted income per share	343,733,947	341,186,431	343,267,240	340,502,432

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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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Amount after tax of pro forma income from continuing operations as if the business combination had been completed at the beginning of a period.

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