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Segments - Adjusted EBITDA Calculation by Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Segment Reporting [Abstract]                      
Net income attributable to CBRE Group, Inc. $ 263,975 $ 104,163 $ 121,668 $ 82,167 $ 180,043 $ 149,123 $ 125,029 $ 92,937 $ 571,973 $ 547,132 $ 484,503
Depreciation and amortization                 366,927 314,096 265,101
Interest expense                 144,851 118,880 112,035
Write-off of financing costs on extinguished debt                   2,685 23,087
Provision for income taxes                 296,662 320,853 263,759
Interest income                 8,051 6,311 6,233
EBITDA                 1,372,362 1,297,335 1,142,252
Integration and other costs related to acquisitions                 125,743 48,865  
Cost-elimination expenses                 78,456 40,439  
Carried interest incentive compensation (reversal) expense to align with the timing of associated revenue                 (15,558) 26,085 23,873
Adjusted EBITDA                 $ 1,561,003 $ 1,412,724 $ 1,166,125