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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Disaggregation Of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | $ 5,760,025 | $ 5,118,285 | $ 16,322,726 | $ 14,652,748
Out of Scope of Topic 606 Revenue | 165,076 | 142,669 | 451,958 | 393,592
Total revenue | 5,925,101 | 5,260,954 | 16,774,684 | 15,046,340
Advisory Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 2,075,636 | 1,916,690 | 5,802,114 | 5,324,307
Out of Scope of Topic 606 Revenue | 165,076 | 142,669 | 451,958 | 393,592
Total revenue | 2,240,712 | 2,059,359 | 6,254,072 | 5,717,899
Global Workplace Solutions [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 3,555,176 | 3,082,781 | 10,106,543 | 8,945,257
Total revenue | 3,555,176 | 3,082,781 | 10,106,543 | 8,945,257
Real Estate Investments [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 129,213 | 118,814 | 414,069 | 383,184
Total revenue | 129,213 | 118,814 | 414,069 | 383,184
Global Workplace Solutions [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 3,555,176 | 3,082,781 | 10,106,543 | 8,945,257
Global Workplace Solutions [Member] | Global Workplace Solutions [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 3,555,176 | 3,082,781 | 10,106,543 | 8,945,257
Advisory Leasing [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 781,246 | 751,793 | 2,221,674 | 1,956,688
Advisory Leasing [Member] | Advisory Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 781,246 | 751,793 | 2,221,674 | 1,956,688
Advisory Sales [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 526,104 | 486,398 | 1,378,317 | 1,357,506
Advisory Sales [Member] | Advisory Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 526,104 | 486,398 | 1,378,317 | 1,357,506
Property and Advisory Project Management [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 558,039 | 498,388 | 1,634,745 | 1,485,371
Property and Advisory Project Management [Member] | Advisory Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 558,039 | 498,388 | 1,634,745 | 1,485,371
Valuation [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 154,861 | 143,814 | 442,238 | 425,374
Valuation [Member] | Advisory Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 154,861 | 143,814 | 442,238 | 425,374
Commercial Mortgage Origination [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 46,787 | 30,939 | 102,471 | 83,077
Out of Scope of Topic 606 Revenue | 117,052 | 101,561 | 322,246 | 277,695
Commercial Mortgage Origination [Member] | Advisory Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 46,787 | 30,939 | 102,471 | 83,077
Out of Scope of Topic 606 Revenue | 117,052 | 101,561 | 322,246 | 277,695
Loan Servicing [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 8,599 | 5,358 | 22,669 | 16,291
Out of Scope of Topic 606 Revenue | 48,024 | 41,108 | 129,712 | 115,897
Loan Servicing [Member] | Advisory Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 8,599 | 5,358 | 22,669 | 16,291
Out of Scope of Topic 606 Revenue | 48,024 | 41,108 | 129,712 | 115,897
Investment Management [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 104,927 | 93,061 | 312,881 | 315,698
Investment Management [Member] | Real Estate Investments [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 104,927 | 93,061 | 312,881 | 315,698
Development Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | 24,286 | 25,753 | 101,188 | 67,486
Development Services [Member] | Real Estate Investments [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Topic 606 Revenue | $ 24,286 | $ 25,753 | $ 101,188 | $ 67,486

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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 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: 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=118956577&loc=SL49130545-203045 + Details
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