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Revenue from Contracts with Customers - Disaggregation of Revenue from Contracts with Customers (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Disaggregation Of Revenue [Line Items] |  |
Topic 606 Revenue | $ 5,745,129 | $ 4,999,172
Out of Scope of Topic 606 Revenue | 144,039 | 136,338
Total revenue | 5,889,168 | 5,135,510
Advisory Services [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Topic 606 Revenue | 1,801,051 | 1,698,064
Out of Scope of Topic 606 Revenue | 130,473 | 136,338
Total revenue | 1,931,524 | 1,834,402
Global Workplace Solutions [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Topic 606 Revenue | 3,746,174 | 3,165,915
Total revenue | 3,746,174 | 3,165,915
Real Estate Investments [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Topic 606 Revenue | 197,904 | 135,193
Out of Scope of Topic 606 Revenue | 13,566 |
Total revenue | 211,470 | 135,193
Global Workplace Solutions [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Topic 606 Revenue | 3,746,174 | 3,165,915
Global Workplace Solutions [Member] | Global Workplace Solutions [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Topic 606 Revenue | 3,746,174 | 3,165,915
Advisory Leasing [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Topic 606 Revenue | 607,111 | 622,640
Advisory Leasing [Member] | Advisory Services [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Topic 606 Revenue | 607,111 | 622,640
Advisory Sales [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Topic 606 Revenue | 430,956 | 385,655
Advisory Sales [Member] | Advisory Services [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Topic 606 Revenue | 430,956 | 385,655
Property and Advisory Project Management [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Topic 606 Revenue | 565,943 | 520,884
Property and Advisory Project Management [Member] | Advisory Services [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Topic 606 Revenue | 565,943 | 520,884
Valuation [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Topic 606 Revenue | 147,752 | 138,326
Valuation [Member] | Advisory Services [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Topic 606 Revenue | 147,752 | 138,326
Commercial Mortgage Origination [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Topic 606 Revenue | 37,880 | 23,573
Out of Scope of Topic 606 Revenue | 85,202 | 97,306
Commercial Mortgage Origination [Member] | Advisory Services [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Topic 606 Revenue | 37,880 | 23,573
Out of Scope of Topic 606 Revenue | 85,202 | 97,306
Loan Servicing [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Topic 606 Revenue | 11,409 | 6,986
Out of Scope of Topic 606 Revenue | 45,271 | 39,032
Loan Servicing [Member] | Advisory Services [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Topic 606 Revenue | 11,409 | 6,986
Out of Scope of Topic 606 Revenue | 45,271 | 39,032
Investment Management [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Topic 606 Revenue | 121,678 | 106,308
Investment Management [Member] | Real Estate Investments [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Topic 606 Revenue | 121,678 | 106,308
Development Services [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Topic 606 Revenue | 76,226 | 28,885
Out of Scope of Topic 606 Revenue | 13,566 |
Development Services [Member] | Real Estate Investments [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Topic 606 Revenue | 76,226 | $ 28,885
Out of Scope of Topic 606 Revenue | $ 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 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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- 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=115929826&loc=d3e8736-108599 Reference 2: 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=115929826&loc=d3e8933-108599 Reference 3: 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=115929826&loc=d3e8736-108599 Reference 4: 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=116634182&loc=SL114868664-224227 + Details
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