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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, 2018 | Mar. 31, 2017
Disaggregation Of Revenue [Line Items] |  |
Total revenue |  | $ 4,050,966
Total revenue | $ 4,673,952 | 4,050,966
Americas [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 2,850,224 | 2,639,206
EMEA [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 1,181,254 | 904,631
Asia Pacific [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 495,459 | 403,346
Commercial Mortgage Origination [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 84,193 | 62,547
Commercial Mortgage Origination [Member] | Americas [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 84,193 | 62,547
Loan Servicing [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 41,814 | 36,410
Loan Servicing [Member] | Americas [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 39,526 | 33,534
Loan Servicing [Member] | EMEA [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 2,288 | 2,876
Other Revenue |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 17,947 | 18,717
Other Revenue | Americas [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 9,764 | 12,714
Other Revenue | EMEA [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 5,823 | 3,761
Other Revenue | Asia Pacific [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 2,360 | 2,242
Total Out of Scope of Topic 606 Revenue [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 143,954 | 117,674
Total Out of Scope of Topic 606 Revenue [Member] | Americas [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 133,483 | 108,795
Total Out of Scope of Topic 606 Revenue [Member] | EMEA [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 8,111 | 6,637
Total Out of Scope of Topic 606 Revenue [Member] | Asia Pacific [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 2,360 | 2,242
ASU 2014-09 [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 4,529,998 | 3,933,292
ASU 2014-09 [Member] | Americas [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 2,716,741 | 2,530,411
ASU 2014-09 [Member] | EMEA [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 1,173,143 | 897,994
ASU 2014-09 [Member] | Asia Pacific [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 493,099 | 401,104
ASU 2014-09 [Member] | Occupier Outsourcing [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 2,954,079 | 2,537,473
ASU 2014-09 [Member] | Occupier Outsourcing [Member] | Americas [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 1,794,147 | 1,664,354
ASU 2014-09 [Member] | Occupier Outsourcing [Member] | EMEA [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 893,817 | 666,694
ASU 2014-09 [Member] | Occupier Outsourcing [Member] | Asia Pacific [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 266,115 | 206,425
ASU 2014-09 [Member] | Leasing [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 572,486 | 529,478
ASU 2014-09 [Member] | Leasing [Member] | Americas [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 400,198 | 393,865
ASU 2014-09 [Member] | Leasing [Member] | EMEA [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 100,589 | 74,931
ASU 2014-09 [Member] | Leasing [Member] | Asia Pacific [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 71,579 | 60,528
ASU 2014-09 [Member] | Sales [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 405,568 | 353,794
ASU 2014-09 [Member] | Sales [Member] | Americas [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 267,675 | 233,796
ASU 2014-09 [Member] | Sales [Member] | EMEA [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 78,240 | 67,300
ASU 2014-09 [Member] | Sales [Member] | Asia Pacific [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 59,235 | 52,168
ASU 2014-09 [Member] | Property Management [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 303,624 | 272,726
ASU 2014-09 [Member] | Property Management [Member] | Americas [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 173,828 | 161,397
ASU 2014-09 [Member] | Property Management [Member] | EMEA [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 58,211 | 54,740
ASU 2014-09 [Member] | Property Management [Member] | Asia Pacific [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 70,030 | 54,679
ASU 2014-09 [Member] | Valuation [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 126,218 | 116,455
ASU 2014-09 [Member] | Valuation [Member] | Americas [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 59,066 | 57,181
ASU 2014-09 [Member] | Valuation [Member] | EMEA [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 41,063 | 32,509
ASU 2014-09 [Member] | Valuation [Member] | Asia Pacific [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 26,089 | 26,765
ASU 2014-09 [Member] | Investment Management [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 123,690 | 89,566
ASU 2014-09 [Member] | Development Services [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 21,232 | 11,623
ASU 2014-09 [Member] | Commercial Mortgage Origination [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 23,101 | 22,177
ASU 2014-09 [Member] | Commercial Mortgage Origination [Member] | Americas [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 21,827 | 19,818
ASU 2014-09 [Member] | Commercial Mortgage Origination [Member] | EMEA [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 1,223 | 1,820
ASU 2014-09 [Member] | Commercial Mortgage Origination [Member] | Asia Pacific [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 51 | 539
Global Investment Management [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 123,690 | 89,566
Global Investment Management [Member] | ASU 2014-09 [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 123,690 | 89,566
Global Investment Management [Member] | ASU 2014-09 [Member] | Investment Management [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 123,690 | 89,566
Development Services [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 23,325 | 14,217
Development Services [Member] | ASU 2014-09 [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 23,325 | 14,217
Development Services [Member] | ASU 2014-09 [Member] | Leasing [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 120 | 154
Development Services [Member] | ASU 2014-09 [Member] | Sales [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 418 | 530
Development Services [Member] | ASU 2014-09 [Member] | Property Management [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 1,555 | 1,910
Development Services [Member] | ASU 2014-09 [Member] | Development Services [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | $ 21,232 | $ 11,623

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 32 -Paragraph 2A -URI http://asc.fasb.org/extlink&oid=82859839&loc=SL82860478-203043 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130539-203045 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=82913847&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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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