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Telford Acquisition - Summary of Pro Forma Results Prepared for Comparative Purposes (Details) - Telford Homes - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]    
Revenue $ 24,158,427 $ 21,803,506
Operating income 1,294,480 1,157,051
Net income attributable to CBRE Group, Inc. $ 1,321,097 $ 1,121,469
Basic income per share:    
Net income per share attributable to CBRE Group, Inc. (in USD per share) $ 3.93 $ 3.31
Weighted average shares outstanding for basic income per share (in shares) 335,795,654 339,321,056
Diluted income per share:    
Net income per share attributable to CBRE Group, Inc. (in USD per share) $ 3.88 $ 3.27
Weighted average shares outstanding for diluted income per share (in shares) 340,522,871 343,122,741