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FacilitySource Acquisition - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 12, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]        
Revenue   $ 21,340,088 $ 18,628,787 $ 17,369,108
Operating loss   1,087,989 1,078,682 816,831
Net income attributable to CBRE Group, Inc.   1,063,219 697,109 573,079
Direct transaction and integration costs   $ 9,124 $ 27,351 $ 125,743
FacilitySource [Member]        
Business Acquisition [Line Items]        
Date of business purchase agreement   Jun. 12, 2018    
Estimated purchase price $ 266,465      
Purchase price payable in cash $ 263,000      
Revenue   $ 121,600    
Operating loss   (3,900)    
Net income attributable to CBRE Group, Inc.   (2,900)    
Direct transaction and integration costs   6,700    
Depreciation and amortization expense   4,000    
Removal of direct costs   6,700    
Removal of tax impact   $ 6,700    
Blocker Corp [Member]        
Business Acquisition [Line Items]        
Blocker Units purchase from Stockholders 1,686,013