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Acquisition of Global Workplace Solutions (GWS) - Summary of Pro Forma Results Prepared for Comparative Purposes (Detail) - Global Workplace Solutions (GWS) [Member] - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Business Acquisition [Line Items] |  |
Revenue | $ 12,972,810 | $ 12,492,918
Operating income | 902,612 | 734,571
Net income attributable to CBRE Group, Inc. | $ 581,807 | $ 422,676
Basic income per share: |  |
Net income per share attributable to CBRE Group, Inc. | $ 1.75 | $ 1.28
Weighted average shares outstanding for basic income per share | 332,616,301 | 330,620,206
Diluted income per share: |  |
Net income per share attributable to CBRE Group, Inc. | $ 1.73 | $ 1.26
Weighted average shares outstanding for diluted income per share | 336,414,856 | 334,171,509

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