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FacilitySource Acquisition - Summary of Pro Forma Results Prepared for Comparative Purposes (Detail) - FacilitySource [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Business Acquisition [Line Items]
Revenue	$ 5,141,339	$ 4,476,952	$ 9,852,160	$ 8,565,300
Operating income	218,988	220,565	424,689	418,015
Net income attributable to CBRE Group, Inc.	$ 222,941	$ 195,874	$ 366,083	$ 326,993
Basic income per share:
Net income per share attributable to CBRE Group, Inc.	$ 0.66	$ 0.58	$ 1.08	$ 0.97
Weighted average shares outstanding for basic income per share	339,081,556	336,975,149	338,986,354	336,941,681
Diluted income per share:
Net income per share attributable to CBRE Group, Inc.	$ 0.65	$ 0.57	$ 1.07	$ 0.96
Weighted average shares outstanding for diluted income per share	343,471,513	340,882,603	343,031,189	340,214,246

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The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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Amount after tax of pro forma income from continuing operations as if the business combination had been completed at the beginning of a period.

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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