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Income Per Share Information - Calculations of Basic and Diluted Income Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Basic Income Per Share        
Net income attributable to CBRE Group, Inc. shareholders $ 290,469 $ 199,088 $ 669,424 $ 537,885
Weighted average shares outstanding for basic income per share 339,477,316 337,948,324 339,151,807 337,280,914
Basic income per share attributable to CBRE Group, Inc. shareholders $ 0.86 $ 0.59 $ 1.97 $ 1.59
Diluted Income Per Share        
Net income attributable to CBRE Group, Inc. shareholders $ 290,469 $ 199,088 $ 669,424 $ 537,885
Weighted average shares outstanding for diluted income per share:        
Weighted average shares outstanding for basic income per share 339,477,316 337,948,324 339,151,807 337,280,914
Dilutive effect of contingently issuable shares 4,256,631 3,236,525 4,114,910 3,217,594
Dilutive effect of stock options   1,582 523 3,924
Weighted average shares outstanding for diluted income per share 343,733,947 341,186,431 343,267,240 340,502,432
Diluted income per share attributable to CBRE Group, Inc. shareholders $ 0.85 $ 0.58 $ 1.95 $ 1.58