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Income Per Share Information - Computation of Basic and Diluted Income Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Basic Income Per Share        
Net income attributable to CBRE Group, Inc. shareholders $ 104,163 $ 149,123 $ 307,998 $ 367,089
Weighted average shares outstanding for basic income per share 335,770,122 332,684,487 334,949,606 332,223,036
Basic income per share attributable to CBRE Group, Inc. shareholders $ 0.31 $ 0.45 $ 0.92 $ 1.10
Diluted Income Per Share        
Net income attributable to CBRE Group, Inc. shareholders $ 104,163 $ 149,123 $ 307,998 $ 367,089
Weighted average shares outstanding for basic income per share 335,770,122 332,684,487 334,949,606 332,223,036
Dilutive effect of contingently issuable shares 2,707,401 3,747,524 3,070,134 3,701,801
Dilutive effect of stock options 11,452 129,866 33,557 216,086
Weighted average shares outstanding for diluted income per share 338,488,975 336,561,877 338,053,297 336,140,923
Diluted income per share attributable to CBRE Group, Inc. shareholders $ 0.31 $ 0.44 $ 0.91 $ 1.09