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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
	Mar. 31, 2018	Mar. 31, 2017
Basic Income Per Share
Net income attributable to CBRE Group, Inc. shareholders	$ 150,288	$ 137,020
Weighted average shares outstanding for basic income per share	338,890,098	336,907,836
Basic income per share attributable to CBRE Group, Inc. shareholders	$ 0.44	$ 0.41
Diluted Income Per Share
Net income attributable to CBRE Group, Inc. shareholders	$ 150,288	$ 137,020
Weighted average shares outstanding for basic income per share	338,890,098	336,907,836
Dilutive effect of contingently issuable shares	3,698,143	2,774,785
Dilutive effect of stock options	1,569	7,958
Weighted average shares outstanding for diluted income per share	342,589,810	339,690,579
Diluted income per share attributable to CBRE Group, Inc. shareholders	$ 0.44	$ 0.40

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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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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of contingently issuable shares. Contingently issuable shares are those shares that are issuable for little or no cash contingent on certain conditions being met.

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