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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 |  |  |  |

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