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Revenue from Contracts with Customers - Disaggregation of Revenue from Contracts with Customers (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
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 23,170,119 | $ 23,274,086 | $ 20,778,100
Total Out of Scope of Topic 606 Revenue |  |  |  |  |  |  |  |  | 656,076 | 620,005 | 561,988
Total revenue | $ 6,910,501 | $ 5,645,142 | $ 5,381,384 | $ 5,889,168 | $ 7,119,407 | $ 5,925,101 | $ 5,714,073 | $ 5,135,510 | 23,826,195 | 23,894,091 | 21,340,088
Advisory Services |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 7,058,120 | 8,471,939 | 7,878,014
Total Out of Scope of Topic 606 Revenue |  |  |  |  |  |  |  |  | 640,872 | 597,529 | 561,988
Total revenue |  |  |  |  |  |  |  |  | 7,698,992 | 9,069,468 | 8,440,002
Global Workplace Solutions |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 15,295,673 | 14,164,001 | 12,365,362
Total Out of Scope of Topic 606 Revenue |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total revenue |  |  |  |  |  |  |  |  | 15,295,673 | 14,164,001 | 12,365,362
Real Estate Investments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 816,326 | 638,146 | 534,724
Total Out of Scope of Topic 606 Revenue |  |  |  |  |  |  |  |  | 15,204 | 22,476 | 0
Total revenue |  |  |  |  |  |  |  |  | 831,530 | 660,622 | 534,724
Global Workplace Solutions |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 15,295,673 | 14,164,001 | 12,365,362
Global Workplace Solutions | Advisory Services |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 0 | 0 | 0
Global Workplace Solutions | Global Workplace Solutions |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 15,295,673 | 14,164,001 | 12,365,362
Global Workplace Solutions | Real Estate Investments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 0 | 0 | 0
Advisory leasing |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 2,404,273 | 3,269,993 | 3,080,117
Advisory leasing | Advisory Services |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 2,404,273 | 3,269,993 | 3,080,117
Advisory leasing | Global Workplace Solutions |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 0 | 0 | 0
Advisory leasing | Real Estate Investments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 0 | 0 | 0
Advisory sales |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,658,702 | 2,130,979 | 1,980,932
Advisory sales | Advisory Services |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,658,702 | 2,130,979 | 1,980,932
Advisory sales | Global Workplace Solutions |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 0 | 0 | 0
Advisory sales | Real Estate Investments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 0 | 0 | 0
Property and advisory project management |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 2,204,263 | 2,255,398 | 2,057,433
Property and advisory project management | Advisory Services |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 2,204,263 | 2,255,398 | 2,057,433
Property and advisory project management | Global Workplace Solutions |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 0 | 0
Property and advisory project management | Real Estate Investments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 0 | 0
Valuation |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 614,307 | 630,399 | 598,806
Valuation | Advisory Services |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 614,307 | 630,399 | 598,806
Valuation | Global Workplace Solutions |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 0 | 0 | 0
Valuation | Real Estate Investments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 0 | 0 | 0
Commercial mortgage origination |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 130,883 | 154,227 | 136,534
Total Out of Scope of Topic 606 Revenue |  |  |  |  |  |  |  |  | 446,968 | 421,736 | 402,814
Commercial mortgage origination | Advisory Services |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 130,883 | 154,227 | 136,534
Total Out of Scope of Topic 606 Revenue |  |  |  |  |  |  |  |  | 446,968 | 421,736 | 402,814
Commercial mortgage origination | Global Workplace Solutions |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total Out of Scope of Topic 606 Revenue |  |  |  |  |  |  |  |  | 0 | 0 | 0
Commercial mortgage origination | Real Estate Investments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total Out of Scope of Topic 606 Revenue |  |  |  |  |  |  |  |  | 0 | 0 | 0
Loan servicing |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 45,692 | 30,943 | 24,192
Total Out of Scope of Topic 606 Revenue |  |  |  |  |  |  |  |  | 193,904 | 175,793 | 159,174
Loan servicing | Advisory Services |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 45,692 | 30,943 | 24,192
Total Out of Scope of Topic 606 Revenue |  |  |  |  |  |  |  |  | 193,904 | 175,793 | 159,174
Loan servicing | Global Workplace Solutions |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total Out of Scope of Topic 606 Revenue |  |  |  |  |  |  |  |  | 0 | 0 | 0
Loan servicing | Real Estate Investments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total Out of Scope of Topic 606 Revenue |  |  |  |  |  |  |  |  | 0 | 0 | 0
Investment management |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 474,939 | 424,882 | 434,405
Investment management | Advisory Services |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 0 | 0 | 0
Investment management | Global Workplace Solutions |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 0 | 0 | 0
Investment management | Real Estate Investments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 474,939 | 424,882 | 434,405
Development services |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 341,387 | 213,264 | 100,319
Total Out of Scope of Topic 606 Revenue |  |  |  |  |  |  |  |  | 15,204 | 22,476 |
Development services | Advisory Services |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total Out of Scope of Topic 606 Revenue |  |  |  |  |  |  |  |  | 0 | 0 |
Development services | Global Workplace Solutions |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total Out of Scope of Topic 606 Revenue |  |  |  |  |  |  |  |  | 0 | 0 |
Development services | Real Estate Investments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 341,387 | 213,264 | $ 100,319
Total Out of Scope of Topic 606 Revenue |  |  |  |  |  |  |  |  | $ 15,204 | $ 22,476 |

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