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Revenue from Contracts with Customers - Disaggregation of Revenue from Contracts with Customers (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Disaggregation of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | $ 6,630,575 | $ 5,487,176 | $ 18,705,598 | $ 16,484,546
Total Out of Scope of Topic 606 Revenue | 167,752 | 157,966 | 490,221 | 431,148
Total Revenue | 6,798,327 | 5,645,142 | 19,195,819 | 16,915,694
Corporate, other and eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | (4,795) | (5,758) | (15,397) | (20,168)
Total Out of Scope of Topic 606 Revenue | 0 | 0 | 0 | 0
Total Revenue | (4,795) | (5,758) | (15,397) | (20,168)
Advisory Services | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 2,245,464 | 1,472,871 | 5,780,450 | 4,470,953
Total Out of Scope of Topic 606 Revenue | 166,683 | 157,139 | 476,694 | 415,976
Total Revenue | 2,412,147 | 1,630,010 | 6,257,144 | 4,886,929
Global Workplace Solutions | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 4,167,143 | 3,851,278 | 12,275,748 | 11,506,240
Total Out of Scope of Topic 606 Revenue | 0 | 0 | 0 | 0
Total Revenue | 4,167,143 | 3,851,278 | 12,275,748 | 11,506,240
Real Estate Investments | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 222,763 | 168,785 | 664,797 | 527,521
Total Out of Scope of Topic 606 Revenue | 1,069 | 827 | 13,527 | 15,172
Total Revenue | 223,832 | 169,612 | 678,324 | 542,693
Facilities management |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 3,480,090 | 3,284,688 | 10,395,345 | 9,917,520
Facilities management | Global Workplace Solutions | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 3,480,090 | 3,284,688 | 10,395,345 | 9,917,520
Advisory leasing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 869,124 | 549,233 | 2,082,248 | 1,693,998
Advisory leasing | Corporate, other and eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Topic 606 Revenue |  |  |  | (2,041)
Advisory leasing | Advisory Services | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 869,124 | 549,233 | 2,082,248 | 1,696,039
Advisory sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 673,411 | 348,238 | 1,677,557 | 1,022,914
Advisory sales | Advisory Services | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 673,411 | 348,238 | 1,677,557 | 1,022,914
Property management |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 427,863 | 400,797 | 1,267,693 | 1,207,019
Property management | Corporate, other and eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | (4,795) | (5,758) | (15,397) | (18,127)
Property management | Advisory Services | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 432,658 | 406,555 | 1,283,090 | 1,225,146
Project management |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 687,053 | 566,590 | 1,880,403 | 1,588,720
Project management | Global Workplace Solutions | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 687,053 | 566,590 | 1,880,403 | 1,588,720
Valuation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 176,644 | 138,945 | 517,460 | 418,520
Valuation | Advisory Services | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 176,644 | 138,945 | 517,460 | 418,520
Commercial mortgage origination |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 82,033 | 20,040 | 187,995 | 78,044
Total Out of Scope of Topic 606 Revenue | 99,780 | 108,986 | 295,561 | 274,523
Commercial mortgage origination | Advisory Services | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 82,033 | 20,040 | 187,995 | 78,044
Total Out of Scope of Topic 606 Revenue | 99,780 | 108,986 | 295,561 | 274,523
Loan servicing |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 11,594 | 9,860 | 32,100 | 30,290
Total Out of Scope of Topic 606 Revenue | 66,903 | 48,153 | 181,133 | 141,453
Loan servicing | Advisory Services | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 11,594 | 9,860 | 32,100 | 30,290
Total Out of Scope of Topic 606 Revenue | 66,903 | 48,153 | 181,133 | 141,453
Investment management |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 135,175 | 99,935 | 406,516 | 324,744
Total Out of Scope of Topic 606 Revenue |  |  |  | 15,172
Investment management | Real Estate Investments | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 135,175 | 99,935 | 406,516 | 324,744
Total Out of Scope of Topic 606 Revenue |  |  |  | 15,172
Development services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 87,588 | 68,850 | 258,281 | 202,777
Total Out of Scope of Topic 606 Revenue | 1,069 | 827 | 13,527 |
Development services | Real Estate Investments | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 87,588 | 68,850 | 258,281 | $ 202,777
Total Out of Scope of Topic 606 Revenue | $ 1,069 | $ 827 | $ 13,527 |

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9031-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9038-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130543-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9054-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130545-203045 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
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