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Income Per Share Information - Calculations of Basic and Diluted Income Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Basic Income Per Share
Net income attributable to CBRE Group, Inc. shareholders	$ 228,667	$ 201,777	$ 378,955	$ 338,797
Weighted average shares outstanding for basic income per share	339,081,556	336,975,149	338,986,354	336,941,681
Basic income per share attributable to CBRE Group, Inc. shareholders	$ 0.67	$ 0.60	$ 1.12	$ 1.01
Diluted Income Per Share
Net income attributable to CBRE Group, Inc. shareholders	$ 228,667	$ 201,777	$ 378,955	$ 338,797
Weighted average shares outstanding for diluted income per share:
Weighted average shares outstanding for basic income per share	339,081,556	336,975,149	338,986,354	336,941,681
Dilutive effect of contingently issuable shares	4,389,957	3,905,498	4,044,050	3,267,556
Dilutive effect of stock options		1,956	785	5,009
Weighted average shares outstanding for diluted income per share	343,471,513	340,882,603	343,031,189	340,214,246
Diluted income per share attributable to CBRE Group, Inc. shareholders	$ 0.67	$ 0.59	$ 1.10	$ 1.00

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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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