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FacilitySource Acquisition - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 12, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Business Acquisition [Line Items]          
Revenue   $ 5,111,434 $ 4,439,571 $ 9,785,386 $ 8,490,537
Operating loss   225,316 228,328 438,925 433,539
Net income attributable to CBRE Group, Inc.   228,667 201,777 $ 378,955 338,797
Direct transaction and integration costs     $ 15,408   $ 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   12,600   $ 12,600  
Operating loss   (200)   (200)  
Net income attributable to CBRE Group, Inc.   (200)   (200)  
Direct transaction and integration costs   200   200  
Depreciation and amortization expense   $ 600   600  
Removal of direct costs       200  
Removal of tax impact       $ 200  
Blocker Corp [Member]          
Business Acquisition [Line Items]          
Blocker Units purchase from Stockholders 1,686,013