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New Accounting Pronouncements - Schedule of Adoption of New Revenue Recognition Guidance on Financial Statement - Consolidated Statements of Operations (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]        
Cumulative adjustment to accumulated earnings   $ 4,050,966    
Cost of services $ 3,619,961 3,146,477    
Operating, administrative and other 732,235 606,626    
Operating income 213,609 205,211    
Income before provision for income taxes 196,289 192,745    
Provision for income taxes 46,164 53,819    
Net income 150,125 138,926    
Net income attributable to CBRE Group, Inc. $ 150,288 $ 137,020    
Net income per share attributable to CBRE Group, Inc. $ 0.44 $ 0.41    
Net income per share attributable to CBRE Group, Inc. $ 0.44 $ 0.40    
ASU 2014-09 [Member]        
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]        
Cumulative adjustment to accumulated earnings $ 4,529,998 $ 3,933,292    
As Reported [Member]        
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]        
Cumulative adjustment to accumulated earnings   2,981,204    
Cost of services   2,087,079    
Operating, administrative and other   606,231    
Operating income   195,242    
Income before provision for income taxes   182,776    
Provision for income taxes   51,273    
Net income   131,503    
Net income attributable to CBRE Group, Inc.   $ 129,597    
Net income per share attributable to CBRE Group, Inc.   $ 0.38    
Net income per share attributable to CBRE Group, Inc.   $ 0.38    
Adoption of new revenue recognition guidance [Member] | ASU 2014-09 [Member]        
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]        
Cumulative adjustment to accumulated earnings   $ 1,069,762 $ 5,600 $ 1,100
Cost of services   1,059,398    
Operating, administrative and other   395    
Operating income   9,969    
Income before provision for income taxes   9,969    
Provision for income taxes   2,546    
Net income   7,423    
Net income attributable to CBRE Group, Inc.   $ 7,423    
Net income per share attributable to CBRE Group, Inc.   $ 0.03    
Net income per share attributable to CBRE Group, Inc.   $ 0.02