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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 |  |  |

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