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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, 2019	Dec. 31, 2018	Dec. 31, 2017
Basic Income Per Share
Net income attributable to CBRE Group, Inc. shareholders	$ 1,282,357	$ 1,063,219	$ 697,109
Weighted average shares outstanding for basic income per share	335,795,654	339,321,056	337,658,017
Basic income per share attributable to CBRE Group, Inc. shareholders	$ 3.82	$ 3.13	$ 2.06
Diluted Income Per Share
Net income attributable to CBRE Group, Inc. shareholders	$ 1,282,357	$ 1,063,219	$ 697,109
Weighted average shares outstanding for basic income per share	335,795,654	339,321,056	337,658,017
Dilutive effect of contingently issuable shares	4,727,217	3,801,293	3,121,987
Dilutive effect of stock options		392	3,552
Weighted average shares outstanding for diluted income per share	340,522,871	343,122,741	340,783,556
Diluted income per share attributable to CBRE Group, Inc. shareholders	$ 3.77	$ 3.10	$ 2.05

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