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FacilitySource Acquisition - Summary of Pro Forma Results Prepared for Comparative Purposes (Detail) - FacilitySource [Member] - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |
Revenue | $ 21,437,014 | $ 18,778,312 | $ 17,472,602
Operating income | 1,089,738 | 1,058,834 | 794,495
Net income attributable to CBRE Group, Inc. | $ 1,061,916 | $ 680,392 | $ 555,332
Basic income per share: |  |  |
Net income per share attributable to CBRE Group, Inc. | $ 3.13 | $ 2.02 | $ 1.66
Weighted average shares outstanding for basic income per share | 339,321,056 | 337,658,017 | 335,414,831
Diluted income per share: |  |  |
Net income per share attributable to CBRE Group, Inc. | $ 3.09 | $ 2.00 | $ 1.64
Weighted average shares outstanding for diluted income per share | 343,122,741 | 340,783,556 | 338,424,563

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