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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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