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Revenue from Contracts with Customers - Disaggregation of Revenue from Contracts with Customers (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | $ 4,950,192 | $ 4,308,449 | $ 9,480,190 | $ 8,241,741
Total revenue | 5,111,434 | 4,439,571 | 9,785,386 | 8,490,537
Occupier Outsourcing [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 3,183,567 | 2,705,286 | 6,137,646 | 5,242,759
Leasing [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 743,980 | 619,916 | 1,316,466 | 1,149,394
Sales [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 436,600 | 434,233 | 842,168 | 788,027
Property Management [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 304,621 | 280,023 | 608,245 | 552,749
Valuation [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 138,367 | 129,768 | 264,585 | 246,223
Commercial Mortgage Origination [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 28,647 | 32,783 | 51,748 | 54,960
Total revenue | 91,167 | 71,727 | 175,360 | 134,274
Investment Management [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 98,947 | 92,763 | 222,637 | 182,329
Development Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 15,463 | 13,677 | 36,695 | 25,300
Loan Servicing [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 43,908 | 39,872 | 85,722 | 76,282
Other Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 26,167 | 19,523 | 44,114 | 38,240
Total Out of Scope of Topic 606 Revenue [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 161,242 | 131,122 | 305,196 | 248,796
Americas [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 2,993,660 | 2,706,638 | 5,710,401 | 5,237,049
Total revenue | 3,140,427 | 2,826,923 | 5,990,651 | 5,466,129
Americas [Member] | Occupier Outsourcing [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 1,923,585 | 1,742,122 | 3,717,732 | 3,406,476
Americas [Member] | Leasing [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 536,660 | 450,208 | 936,858 | 844,073
Americas [Member] | Sales [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 269,636 | 261,710 | 537,311 | 495,506
Americas [Member] | Property Management [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 172,343 | 161,116 | 346,171 | 322,513
Americas [Member] | Valuation [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 64,346 | 61,599 | 123,412 | 118,780
Americas [Member] | Commercial Mortgage Origination [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 27,090 | 29,883 | 48,917 | 49,701
Total revenue | 91,167 | 71,727 | 175,360 | 134,274
Americas [Member] | Loan Servicing [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 41,327 | 37,190 | 80,853 | 70,724
Americas [Member] | Other Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 14,273 | 11,368 | 24,037 | 24,082
Americas [Member] | Total Out of Scope of Topic 606 Revenue [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 146,767 | 120,285 | 280,250 | 229,080
EMEA [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 1,304,817 | 1,007,484 | 2,477,960 | 1,905,478
Total revenue | 1,315,452 | 1,016,020 | 2,496,706 | 1,920,651
EMEA [Member] | Occupier Outsourcing [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 995,265 | 726,890 | 1,889,082 | 1,393,584
EMEA [Member] | Leasing [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 106,295 | 88,076 | 206,884 | 163,007
EMEA [Member] | Sales [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 98,081 | 94,055 | 176,321 | 161,355
EMEA [Member] | Property Management [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 60,706 | 59,249 | 118,917 | 113,989
EMEA [Member] | Valuation [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 43,256 | 37,229 | 84,319 | 69,738
EMEA [Member] | Commercial Mortgage Origination [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 1,214 | 1,985 | 2,437 | 3,805
EMEA [Member] | Loan Servicing [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 2,360 | 2,682 | 4,648 | 5,558
EMEA [Member] | Other Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 8,275 | 5,854 | 14,098 | 9,615
EMEA [Member] | Total Out of Scope of Topic 606 Revenue [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 10,635 | 8,536 | 18,746 | 15,173
Asia Pacific [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 534,360 | 484,598 | 1,027,459 | 885,702
Total revenue | 538,200 | 486,899 | 1,033,659 | 890,245
Asia Pacific [Member] | Occupier Outsourcing [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 264,717 | 236,274 | 530,832 | 442,699
Asia Pacific [Member] | Leasing [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 100,186 | 81,606 | 171,765 | 142,134
Asia Pacific [Member] | Sales [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 68,883 | 78,303 | 128,118 | 130,471
Asia Pacific [Member] | Property Management [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 69,466 | 56,560 | 139,496 | 111,239
Asia Pacific [Member] | Valuation [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 30,765 | 30,940 | 56,854 | 57,705
Asia Pacific [Member] | Commercial Mortgage Origination [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 343 | 915 | 394 | 1,454
Asia Pacific [Member] | Loan Servicing [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 221 |  | 221 |
Asia Pacific [Member] | Other Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 3,619 | 2,301 | 5,979 | 4,543
Asia Pacific [Member] | Total Out of Scope of Topic 606 Revenue [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 3,840 | 2,301 | 6,200 | 4,543
Global Investment Management [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 98,947 | 92,763 | 222,637 | 182,329
Total revenue | 98,947 | 92,763 | 222,637 | 182,329
Global Investment Management [Member] | Investment Management [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 98,947 | 92,763 | 222,637 | 182,329
Development Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 18,408 | 16,966 | 41,733 | 31,183
Total revenue | 18,408 | 16,966 | 41,733 | 31,183
Development Services [Member] | Leasing [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 839 | 26 | 959 | 180
Development Services [Member] | Sales [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue |  | 165 | 418 | 695
Development Services [Member] | Property Management [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 2,106 | 3,098 | 3,661 | 5,008
Development Services [Member] | Development Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | $ 15,463 | $ 13,677 | $ 36,695 | $ 25,300

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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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