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FacilitySource Acquisition - Summary of Pro Forma Results Prepared for Comparative Purposes (Detail) - FacilitySource [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Revenue	$ 21,437,014	$ 18,778,312	$ 17,472,602
Operating income	1,089,738	1,058,834	794,495
Net income attributable to CBRE Group, Inc.	$ 1,061,916	$ 680,392	$ 555,332
Basic income per share:
Net income per share attributable to CBRE Group, Inc.	$ 3.13	$ 2.02	$ 1.66
Weighted average shares outstanding for basic income per share	339,321,056	337,658,017	335,414,831
Diluted income per share:
Net income per share attributable to CBRE Group, Inc.	$ 3.09	$ 2.00	$ 1.64
Weighted average shares outstanding for diluted income per share	343,122,741	340,783,556	338,424,563

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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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