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Income Per Share and Stockholders' Equity - Calculations of Basic and Diluted Income Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Basic Income Per Share
Net income attributable to CBRE Group, Inc. shareholders	$ 164,409	$ 150,288
Weighted average shares outstanding for basic income per share	336,020,431	338,890,098
Basic income per share attributable to CBRE Group, Inc. shareholders	$ 0.49	$ 0.44
Diluted Income Per Share
Net income attributable to CBRE Group, Inc. shareholders	$ 164,409	$ 150,288
Weighted average shares outstanding for basic income per share	336,020,431	338,890,098
Dilutive effect of contingently issuable shares	4,137,968	3,698,143
Dilutive effect of stock options		1,569
Weighted average shares outstanding for diluted income per share	340,158,399	342,589,810
Diluted income per share attributable to CBRE Group, Inc. shareholders	$ 0.48	$ 0.44

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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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