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Revenue from Contracts with Customers - Disaggregation of Revenue from Contracts with Customers (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disaggregation Of Revenue [Line Items] |  |  |
Topic 606 Revenue | $ 23,274,086 | $ 20,778,100 | $ 18,152,507
Out of Scope of Topic 606 Revenue | 620,005 | 561,988 | 476,280
Total revenue | 23,894,091 | 21,340,088 | 18,628,787
Advisory Services [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Topic 606 Revenue | 8,471,939 | 7,878,014 | 6,903,445
Out of Scope of Topic 606 Revenue | 597,529 | 561,988 | 476,280
Total revenue | 9,069,468 | 8,440,002 | 7,379,725
Global Workplace Solutions [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Topic 606 Revenue | 14,164,001 | 12,365,362 | 10,791,963
Total revenue | 14,164,001 | 12,365,362 | 10,791,963
Real Estate Investments [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Topic 606 Revenue | 638,146 | 534,724 | 457,099
Out of Scope of Topic 606 Revenue | 22,476 |  |
Total revenue | 660,622 | 534,724 | 457,099
Global Workplace Solutions [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Topic 606 Revenue | 14,164,001 | 12,365,362 | 10,791,963
Global Workplace Solutions [Member] | Global Workplace Solutions [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Topic 606 Revenue | 14,164,001 | 12,365,362 | 10,791,963
Advisory Leasing [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Topic 606 Revenue | 3,269,993 | 3,080,117 | 2,592,203
Advisory Leasing [Member] | Advisory Services [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Topic 606 Revenue | 3,269,993 | 3,080,117 | 2,592,203
Advisory Sales [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Topic 606 Revenue | 2,130,979 | 1,980,932 | 1,869,872
Advisory Sales [Member] | Advisory Services [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Topic 606 Revenue | 2,130,979 | 1,980,932 | 1,869,872
Property and Advisory Project Management [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Topic 606 Revenue | 2,255,398 | 2,057,433 | 1,748,594
Property and Advisory Project Management [Member] | Advisory Services [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Topic 606 Revenue | 2,255,398 | 2,057,433 | 1,748,594
Valuation [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Topic 606 Revenue | 630,399 | 598,806 | 556,008
Valuation [Member] | Advisory Services [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Topic 606 Revenue | 630,399 | 598,806 | 556,008
Commercial Mortgage Origination [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Topic 606 Revenue | 154,227 | 136,534 | 117,009
Out of Scope of Topic 606 Revenue | 421,736 | 402,814 | 338,590
Commercial Mortgage Origination [Member] | Advisory Services [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Topic 606 Revenue | 154,227 | 136,534 | 117,009
Out of Scope of Topic 606 Revenue | 421,736 | 402,814 | 338,590
Loan Servicing [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Topic 606 Revenue | 30,943 | 24,192 | 19,759
Out of Scope of Topic 606 Revenue | 175,793 | 159,174 | 137,690
Loan Servicing [Member] | Advisory Services [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Topic 606 Revenue | 30,943 | 24,192 | 19,759
Out of Scope of Topic 606 Revenue | 175,793 | 159,174 | 137,690
Investment Management [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Topic 606 Revenue | 424,882 | 434,405 | 377,644
Investment Management [Member] | Real Estate Investments [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Topic 606 Revenue | 424,882 | 434,405 | 377,644
Development Services [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Topic 606 Revenue | 213,264 | 100,319 | 79,455
Out of Scope of Topic 606 Revenue | 22,476 |  |
Development Services [Member] | Real Estate Investments [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Topic 606 Revenue | 213,264 | $ 100,319 | $ 79,455
Out of Scope of Topic 606 Revenue | $ 22,476 |  |

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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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