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FacilitySource Acquisition - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 12, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Business Acquisition [Line Items]          
Revenue   $ 5,260,954 $ 4,638,596 $ 15,046,340 $ 13,129,133
Operating loss   189,717 238,956 628,642 672,495
Net income attributable to CBRE Group, Inc.   290,469 $ 199,088 669,424 537,885
Direct transaction and integration costs   6,100   $ 6,100 $ 27,351
FacilitySource [Member]          
Business Acquisition [Line Items]          
Date of business purchase agreement       Jun. 12, 2018  
Estimated purchase price $ 265,465        
Purchase price payable in cash $ 262,000        
Revenue   54,900   $ 67,500  
Operating loss   (2,200)   (2,400)  
Net income attributable to CBRE Group, Inc.   (1,600)   (1,800)  
Direct transaction and integration costs   4,400   4,600  
Depreciation and amortization expense   2,300   2,900  
Removal of direct costs   4,400   4,600  
Removal of tax impact   $ 4,400   $ 4,600  
Blocker Corp [Member]          
Business Acquisition [Line Items]          
Blocker Units purchase from Stockholders 1,686,013