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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, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Disaggregation Of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | $ 5,487,176 | $ 5,760,025 | $ 16,484,546 | $ 16,322,726
Out of Scope of Topic 606 Revenue | 157,966 | 165,076 | 431,148 | 451,958
Total revenue | 5,645,142 | 5,925,101 | 16,915,694 | 16,774,684
Advisory Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 1,597,026 | 2,075,636 | 4,822,642 | 5,802,114
Out of Scope of Topic 606 Revenue | 157,139 | 165,076 | 415,976 | 451,958
Total revenue | 1,754,165 | 2,240,712 | 5,238,618 | 6,254,072
Global Workplace Solutions [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 3,721,365 | 3,555,176 | 11,134,383 | 10,106,543
Total revenue | 3,721,365 | 3,555,176 | 11,134,383 | 10,106,543
Real Estate Investments [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 168,785 | 129,213 | 527,521 | 414,069
Out of Scope of Topic 606 Revenue | 827 |  | 15,172 |
Total revenue | 169,612 | 129,213 | 542,693 | 414,069
Global Workplace Solutions [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 3,721,365 | 3,555,176 | 11,134,383 | 10,106,543
Global Workplace Solutions [Member] | Global Workplace Solutions [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 3,721,365 | 3,555,176 | 11,134,383 | 10,106,543
Advisory Leasing [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 536,132 | 781,246 | 1,653,367 | 2,221,674
Advisory Leasing [Member] | Advisory Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 536,132 | 781,246 | 1,653,367 | 2,221,674
Advisory Sales [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 346,650 | 526,104 | 1,018,853 | 1,378,317
Advisory Sales [Member] | Advisory Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 346,650 | 526,104 | 1,018,853 | 1,378,317
Property and Advisory Project Management [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 545,325 | 558,039 | 1,623,486 | 1,634,745
Property and Advisory Project Management [Member] | Advisory Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 545,325 | 558,039 | 1,623,486 | 1,634,745
Valuation [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 139,019 | 154,861 | 418,616 | 442,238
Valuation [Member] | Advisory Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 139,019 | 154,861 | 418,616 | 442,238
Commercial Mortgage Origination [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 20,040 | 46,787 | 78,030 | 102,471
Out of Scope of Topic 606 Revenue | 108,986 | 117,052 | 274,523 | 322,246
Commercial Mortgage Origination [Member] | Advisory Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 20,040 | 46,787 | 78,030 | 102,471
Out of Scope of Topic 606 Revenue | 108,986 | 117,052 | 274,523 | 322,246
Loan Servicing [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 9,860 | 8,599 | 30,290 | 22,669
Out of Scope of Topic 606 Revenue | 48,153 | 48,024 | 141,453 | 129,712
Loan Servicing [Member] | Advisory Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 9,860 | 8,599 | 30,290 | 22,669
Out of Scope of Topic 606 Revenue | 48,153 | 48,024 | 141,453 | 129,712
Investment Management [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 99,935 | 104,927 | 324,745 | 312,881
Investment Management [Member] | Real Estate Investments [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 99,935 | 104,927 | 324,745 | 312,881
Development Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 68,850 | 24,286 | 202,776 | 101,188
Out of Scope of Topic 606 Revenue | 827 |  | 15,172 |
Development Services [Member] | Real Estate Investments [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 68,850 | $ 24,286 | 202,776 | $ 101,188
Out of Scope of Topic 606 Revenue | $ 827 |  | $ 15,172 |

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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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