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Segments - Adjusted EBITDA Calculation by Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Segment Reporting [Abstract]    
Net income attributable to CBRE Group, Inc. $ 129,597 $ 82,167
Depreciation and amortization 94,037 86,994
Interest expense 34,010 34,790
Provision for income taxes 51,273 50,125
Interest income 2,411 1,459
EBITDA 306,506 252,617
Integration and other costs related to acquisitions 11,943 17,173
Cost-elimination expenses   12,403
Carried interest incentive compensation (reversal) expense to align with the timing of associated revenue (15,241) 490
Adjusted EBITDA $ 303,208 $ 282,683