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Segments - Adjusted EBITDA Calculation by Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income attributable to CBRE Group, Inc. | $ 313,765 | $ 184,132 | $ 81,897 | $ 172,195 | $ 637,618 | $ 256,599 | $ 223,731 | $ 164,409 | $ 751,989 | $ 1,282,357 | $ 1,063,219
Depreciation and amortization |  |  |  |  |  |  |  |  | 501,728 | 439,224 | 451,988
Asset impairments |  |  |  |  |  |  |  |  | 88,676 | 89,787 | 0
Interest expense, net of interest income |  |  |  |  |  |  |  |  | 67,753 | 85,754 | 98,685
Write-off of financing costs on extinguished debt |  |  |  |  |  |  |  |  | 75,592 | 2,608 | 27,982
Provision for income taxes |  |  |  |  |  |  |  |  | 214,101 | 69,895 | 313,058
EBITDA |  |  |  |  |  |  |  |  | 1,699,839 | 1,969,625 | 1,954,932
Impact of fair value adjustments to real estate assets acquired in the Telford Acquisition (purchase accounting) that were sold in the period |  |  |  |  |  |  |  |  | 11,598 | 9,301 | 0
Costs incurred related to legal entity restructuring |  |  |  |  |  |  |  |  | 9,362 | 6,899 | 0
Integration and other costs related to acquisitions |  |  |  |  |  |  |  |  | 1,756 | 15,292 | 9,124
Carried interest incentive compensation (reversal) expense to align with the timing of associated revenue |  |  |  |  |  |  |  |  | (22,912) | 13,101 | (5,261)
Costs incurred in connection with litigation settlement |  |  |  |  |  |  |  |  | 0 | 0 | 8,868
One-time gain associated with remeasuring an investment in an unconsolidated subsidiary to fair value as of the date the remaining controlling interest was acquired |  |  |  |  |  |  |  |  | 0 | 0 | (100,420)
Adjusted EBITDA |  |  |  |  |  |  |  |  | 1,892,385 | 2,063,783 | 1,905,168
Cost of revenues |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  | 42,100 |  |
Operating, administrative and other expenses |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  | 113,000 |  |
Transformation Initiatives |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  | 175,840 |  |
Transformation Initiatives | Employee separation benefits, lease termination costs and professional fees |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  | 155,148 | 0 | 0
Transformation Initiatives | Employee separation benefits |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  | 91,077 |  |
2020 Covid-19 Response | Employee separation benefits |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  | 37,594 | 0 | 0
2020 Covid-19 Response | Employee separation benefits | Cost of revenues |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  | 7,400 |  |
2020 Covid-19 Response | Employee separation benefits | Operating, administrative and other expenses |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  | 30,200 |  |
2018 Reorganization Plan | Employee separation benefits |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  | $ 0 | $ 49,565 | $ 37,925

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