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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, 2019 | Mar. 31, 2018
Disaggregation Of Revenue [Line Items] |  |
Total revenue | $ 4,999,172 | $ 4,554,403
Total revenue | 136,338 | 119,549
Total revenue | 5,135,510 | 4,673,952
Advisory Services [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 1,698,064 | 1,579,885
Total revenue | 136,338 | 119,549
Total revenue | 1,834,402 | 1,699,434
Global Workplace Solutions [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 3,165,915 | 2,827,503
Total revenue | 3,165,915 | 2,827,503
Real Estate Investments [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 135,193 | 147,015
Total revenue | 135,193 | 147,015
Global Workplace Solutions [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 3,165,915 | 2,827,503
Global Workplace Solutions [Member] | Global Workplace Solutions [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 3,165,915 | 2,827,503
Advisory Leasing [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 622,640 | 517,509
Advisory Leasing [Member] | Advisory Services [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 622,640 | 517,509
Advisory Sales [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 385,655 | 413,732
Advisory Sales [Member] | Advisory Services [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 385,655 | 413,732
Property and Advisory Project Management [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 520,884 | 484,782
Property and Advisory Project Management [Member] | Advisory Services [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 520,884 | 484,782
Valuation [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 138,326 | 134,163
Valuation [Member] | Advisory Services [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 138,326 | 134,163
Commercial Mortgage Origination [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 23,573 | 24,282
Total revenue | 97,306 | 83,152
Commercial Mortgage Origination [Member] | Advisory Services [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 23,573 | 24,282
Total revenue | 97,306 | 83,152
Loan Servicing [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 6,986 | 5,417
Total revenue | 39,032 | 36,397
Loan Servicing [Member] | Advisory Services [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 6,986 | 5,417
Total revenue | 39,032 | 36,397
Investment Management [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 106,308 | 123,690
Investment Management [Member] | Real Estate Investments [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 106,308 | 123,690
Development Services [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 28,885 | 23,325
Development Services [Member] | Real Estate Investments [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | $ 28,885 | $ 23,325

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&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://fasb.org/us-gaap/role/ref/legacyRef -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=115205541&loc=SL114868664-224227 Reference 3: 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 4: 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 + Details
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