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Revenue from Contracts with Customers - Disaggregation of Revenue from Contracts with Customers (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | $ 20,658,939 | $ 18,048,487 | $ 16,830,004
Total revenue | 21,340,088 | 18,628,787 | 17,369,108
Occupier Outsourcing [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 12,904,741 | 11,145,574 | 10,373,859
Leasing [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 3,375,558 | 2,863,352 | 2,651,986
Sales [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 1,919,140 | 1,806,313 | 1,700,503
Property Management [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 1,244,131 | 1,155,322 | 1,056,034
Valuation [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 560,815 | 527,638 | 504,370
Commercial Mortgage Origination [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 133,829 | 112,131 | 117,814
Total revenue | 402,607 | 338,390 | 330,352
Investment Management [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 434,405 | 377,644 | 369,800
Development Services [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 86,320 | 60,513 | 55,638
Loan Servicing [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 183,421 | 157,449 | 122,517
Other Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 95,121 | 84,461 | 86,235
Total Out of Scope of Topic 606 Revenue [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 681,149 | 580,300 | 539,104
Americas [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 12,506,861 | 11,258,285 | 10,578,010
Total revenue | 13,131,906 | 11,791,377 | 11,069,965
Americas [Member] | Occupier Outsourcing [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 7,797,742 | 7,089,660 | 6,570,559
Americas [Member] | Leasing [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 2,423,248 | 2,054,872 | 1,924,361
Americas [Member] | Sales [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 1,189,368 | 1,103,862 | 1,103,452
Americas [Member] | Property Management [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 709,213 | 660,147 | 621,452
Americas [Member] | Valuation [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 261,559 | 245,179 | 245,389
Americas [Member] | Commercial Mortgage Origination [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 125,731 | 104,565 | 112,797
Total revenue | 402,607 | 338,390 | 330,352
Americas [Member] | Loan Servicing [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 172,096 | 146,460 | 111,373
Americas [Member] | Other Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 50,342 | 48,242 | 50,230
Americas [Member] | Total Out of Scope of Topic 606 Revenue [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 625,045 | 533,092 | 491,955
EMEA [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 5,423,092 | 4,359,253 | 4,094,150
Total revenue | 5,465,923 | 4,396,825 | 4,128,906
EMEA [Member] | Occupier Outsourcing [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 4,030,257 | 3,101,518 | 2,975,106
EMEA [Member] | Leasing [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 526,372 | 446,446 | 411,005
EMEA [Member] | Sales [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 428,810 | 397,130 | 334,398
EMEA [Member] | Property Management [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 244,370 | 243,630 | 221,904
EMEA [Member] | Valuation [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 187,515 | 165,082 | 148,856
EMEA [Member] | Commercial Mortgage Origination [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 5,768 | 5,447 | 2,881
EMEA [Member] | Loan Servicing [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 10,755 | 10,989 | 11,144
EMEA [Member] | Other Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 32,076 | 26,583 | 23,612
EMEA [Member] | Total Out of Scope of Topic 606 Revenue [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 42,831 | 37,572 | 34,756
Asia Pacific [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 2,194,262 | 1,973,850 | 1,717,135
Total revenue | 2,207,535 | 1,983,486 | 1,729,528
Asia Pacific [Member] | Occupier Outsourcing [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 1,076,742 | 954,396 | 828,194
Asia Pacific [Member] | Leasing [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 421,255 | 357,983 | 312,184
Asia Pacific [Member] | Sales [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 300,312 | 304,344 | 261,320
Asia Pacific [Member] | Property Management [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 281,882 | 237,631 | 203,176
Asia Pacific [Member] | Valuation [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 111,741 | 117,377 | 110,125
Asia Pacific [Member] | Commercial Mortgage Origination [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 2,330 | 2,119 | 2,136
Asia Pacific [Member] | Loan Servicing [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 570 |  |
Asia Pacific [Member] | Other Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 12,703 | 9,636 | 12,393
Asia Pacific [Member] | Total Out of Scope of Topic 606 Revenue [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 13,273 | 9,636 | 12,393
Global Investment Management [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 434,405 | 377,644 | 369,800
Total revenue | 434,405 | 377,644 | 369,800
Global Investment Management [Member] | Investment Management [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 434,405 | 377,644 | 369,800
Development Services [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 100,319 | 79,455 | 70,909
Total revenue | 100,319 | 79,455 | 70,909
Development Services [Member] | Leasing [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 4,683 | 4,051 | 4,436
Development Services [Member] | Sales [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 650 | 977 | 1,333
Development Services [Member] | Property Management [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | 8,666 | 13,914 | 9,502
Development Services [Member] | Development Services [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total revenue | $ 86,320 | $ 60,513 | $ 55,638

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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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