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Income Per Share Information - Calculation of Income Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Basic Income Per Share
Net income attributable to CBRE Group, Inc. shareholders	$ 1,063,219	$ 697,109	$ 573,079
Weighted average shares outstanding for basic income per share	339,321,056	337,658,017	335,414,831
Basic income per share attributable to CBRE Group, Inc. shareholders	$ 3.13	$ 2.06	$ 1.71
Diluted Income Per Share
Net income attributable to CBRE Group, Inc. shareholders	$ 1,063,219	$ 697,109	$ 573,079
Weighted average shares outstanding for basic income per share	339,321,056	337,658,017	335,414,831
Dilutive effect of contingently issuable shares	3,801,293	3,121,987	2,982,431
Dilutive effect of stock options	392	3,552	27,301
Weighted average shares outstanding for diluted income per share	343,122,741	340,783,556	338,424,563
Diluted income per share attributable to CBRE Group, Inc. shareholders	$ 3.10	$ 2.05	$ 1.69

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The amount resulting from "as if" assumption that stock options were exercised for purposes of computing the dilutive effect of convertible securities.

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