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Segments - Adjusted EBITDA Calculation by Segment (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting [Abstract]      
Net income attributable to CBRE Group, Inc. $ 691,479 $ 571,973 $ 547,132
Depreciation and amortization 406,114 366,927 314,096
Interest expense 136,814 144,851 118,880
Write-off of financing costs on extinguished debt     2,685
Provision for income taxes 466,147 296,662 320,853
Interest income 9,853 8,051 6,311
EBITDA 1,690,701 1,372,362 1,297,335
Integration and other costs related to acquisitions 27,351 125,743 48,865
Carried interest incentive compensation (reversal) expense to align with the timing of associated revenue (8,518) (15,558) 26,085
Cost-elimination expenses   78,456 40,439
Adjusted EBITDA $ 1,709,534 $ 1,561,003 $ 1,412,724