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Revenue from Contracts with Customers - Disaggregation of Revenue from Contracts with Customers (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Disaggregation of Revenue [Line Items] |  |
Topic 606 Revenue | $ 5,778,432 | $ 5,745,129
Total Out of Scope of Topic 606 Revenue | 160,447 | 144,039
Total revenue | 5,938,879 | 5,889,168
Corporate, other and eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | (6,145) | (9,518)
Advisory Services | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Topic 606 Revenue | 1,548,445 | 1,672,214
Total Out of Scope of Topic 606 Revenue | 159,567 | 130,473
Total revenue | 1,708,012 | 1,802,687
Global Workplace Solutions | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Topic 606 Revenue | 4,025,883 | 3,884,529
Total Out of Scope of Topic 606 Revenue | 0 | 0
Total revenue | 4,025,883 | 3,884,529
Real Estate Investments | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Topic 606 Revenue | 210,249 | 197,904
Total Out of Scope of Topic 606 Revenue | 880 | 13,566
Total revenue | 211,129 | 211,470
Real Estate Investments | Corporate, other and eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Topic 606 Revenue | (6,145) | (9,518)
Total Out of Scope of Topic 606 Revenue | 0 | 0
Total revenue | (6,145) | (9,518)
Facilities management |  |
Disaggregation of Revenue [Line Items] |  |
Topic 606 Revenue | 3,479,501 | 3,335,793
Facilities management | Global Workplace Solutions | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Topic 606 Revenue | 3,479,501 | 3,335,793
Advisory leasing |  |
Disaggregation of Revenue [Line Items] |  |
Topic 606 Revenue | 520,216 | 621,082
Advisory leasing | Advisory Services | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Topic 606 Revenue | 520,216 | 625,028
Advisory leasing | Real Estate Investments | Corporate, other and eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Topic 606 Revenue |  | (3,946)
Advisory sales |  |
Disaggregation of Revenue [Line Items] |  |
Topic 606 Revenue | 392,312 | 431,669
Advisory sales | Advisory Services | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Topic 606 Revenue | 392,312 | 431,669
Property management |  |
Disaggregation of Revenue [Line Items] |  |
Topic 606 Revenue | 421,043 | 412,909
Property management | Advisory Services | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Topic 606 Revenue | 427,188 | 418,481
Property management | Real Estate Investments | Corporate, other and eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Topic 606 Revenue | (6,145) | (5,572)
Project management |  |
Disaggregation of Revenue [Line Items] |  |
Topic 606 Revenue | 546,382 | 548,736
Project management | Global Workplace Solutions | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Topic 606 Revenue | 546,382 | 548,736
Valuation |  |
Disaggregation of Revenue [Line Items] |  |
Topic 606 Revenue | 159,590 | 147,738
Valuation | Advisory Services | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Topic 606 Revenue | 159,590 | 147,738
Commercial mortgage origination |  |
Disaggregation of Revenue [Line Items] |  |
Topic 606 Revenue | 33,751 | 37,889
Total Out of Scope of Topic 606 Revenue | 106,113 | 85,202
Commercial mortgage origination | Advisory Services | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Topic 606 Revenue | 33,751 | 37,889
Total Out of Scope of Topic 606 Revenue | 106,113 | 85,202
Loan servicing |  |
Disaggregation of Revenue [Line Items] |  |
Topic 606 Revenue | 15,388 | 11,409
Total Out of Scope of Topic 606 Revenue | 53,454 | 45,271
Loan servicing | Advisory Services | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Topic 606 Revenue | 15,388 | 11,409
Total Out of Scope of Topic 606 Revenue | 53,454 | 45,271
Investment management |  |
Disaggregation of Revenue [Line Items] |  |
Topic 606 Revenue | 132,071 | 121,678
Investment management | Real Estate Investments | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Topic 606 Revenue | 132,071 | 121,678
Development services |  |
Disaggregation of Revenue [Line Items] |  |
Topic 606 Revenue | 78,178 | 76,226
Total Out of Scope of Topic 606 Revenue | 880 | 13,566
Development services | Real Estate Investments | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Topic 606 Revenue | 78,178 | 76,226
Total Out of Scope of Topic 606 Revenue | $ 880 | $ 13,566

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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=120311839&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=120311839&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=120311839&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=120311839&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=120311839&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=121604090&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=120311839&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=120311839&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=120311839&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=121604090&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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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: 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=120311839&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14064-108612 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=120311839&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=120311839&loc=d3e8933-108599 Reference 6: 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=120311839&loc=d3e8736-108599 Reference 7: 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=120311839&loc=d3e9031-108599 Reference 8: 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=120311839&loc=d3e8906-108599 Reference 9: 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=120311839&loc=d3e9038-108599 Reference 10: 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=120311839&loc=d3e9054-108599 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(g)(1)(ii)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-05(b)(2)) -URI http://asc.fasb.org/extlink&oid=120399901&loc=d3e537907-122884 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(1)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details
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