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Revenue from Contracts with Customers - Disaggregation of Revenue from Contracts with Customers (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | $ 5,092,208 | $ 4,493,760 | $ 14,572,398 | $ 12,735,501
Total revenue | 5,260,954 | 4,638,596 | 15,046,340 | 13,129,133
Occupier Outsourcing [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 3,214,780 | 2,792,236 | 9,352,426 | 8,034,995
Leasing [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 823,041 | 700,799 | 2,139,507 | 1,850,193
Sales [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 472,640 | 455,341 | 1,314,808 | 1,243,368
Property Management [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 303,470 | 288,520 | 911,715 | 841,269
Valuation [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 134,539 | 126,986 | 399,124 | 373,209
Commercial Mortgage Origination [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 29,639 | 24,811 | 81,387 | 79,771
Total revenue | 102,148 | 83,607 | 277,508 | 217,881
Investment Management [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 93,061 | 92,122 | 315,698 | 274,451
Development Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 21,038 | 12,945 | 57,733 | 38,245
Loan Servicing [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 46,466 | 38,336 | 132,188 | 114,618
Other Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 20,132 | 22,893 | 64,246 | 61,133
Total Out of Scope of Topic 606 Revenue [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 168,746 | 144,836 | 473,942 | 393,632
Americas [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 3,122,648 | 2,805,814 | 8,833,049 | 8,042,863
Total revenue | 3,280,722 | 2,939,632 | 9,271,373 | 8,405,761
Americas [Member] | Occupier Outsourcing [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 1,964,677 | 1,764,103 | 5,682,409 | 5,170,579
Americas [Member] | Leasing [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 598,384 | 506,366 | 1,535,242 | 1,350,439
Americas [Member] | Sales [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 294,884 | 290,168 | 832,195 | 785,674
Americas [Member] | Property Management [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 171,824 | 162,670 | 517,995 | 485,183
Americas [Member] | Valuation [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 64,585 | 59,009 | 187,997 | 177,789
Americas [Member] | Commercial Mortgage Origination [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 28,294 | 23,498 | 77,211 | 73,199
Total revenue | 102,148 | 83,607 | 277,508 | 217,881
Americas [Member] | Loan Servicing [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 43,893 | 36,021 | 124,746 | 106,745
Americas [Member] | Other Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 12,033 | 14,190 | 36,070 | 38,272
Americas [Member] | Total Out of Scope of Topic 606 Revenue [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 158,074 | 133,818 | 438,324 | 362,898
EMEA [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 1,323,456 | 1,079,617 | 3,801,416 | 2,985,095
Total revenue | 1,331,436 | 1,088,699 | 3,828,142 | 3,009,350
EMEA [Member] | Occupier Outsourcing [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 993,268 | 787,466 | 2,882,350 | 2,181,050
EMEA [Member] | Leasing [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 123,339 | 105,368 | 330,223 | 268,375
EMEA [Member] | Sales [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 103,664 | 83,937 | 279,985 | 245,292
EMEA [Member] | Property Management [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 59,459 | 62,606 | 178,376 | 176,595
EMEA [Member] | Valuation [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 43,210 | 39,462 | 127,529 | 109,200
EMEA [Member] | Commercial Mortgage Origination [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 516 | 778 | 2,953 | 4,583
EMEA [Member] | Loan Servicing [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 2,387 | 2,315 | 7,035 | 7,873
EMEA [Member] | Other Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 5,593 | 6,767 | 19,691 | 16,382
EMEA [Member] | Total Out of Scope of Topic 606 Revenue [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 7,980 | 9,082 | 26,726 | 24,255
Asia Pacific [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 527,290 | 500,096 | 1,554,749 | 1,385,798
Total revenue | 529,982 | 502,032 | 1,563,641 | 1,392,277
Asia Pacific [Member] | Occupier Outsourcing [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 256,835 | 240,667 | 787,667 | 683,366
Asia Pacific [Member] | Leasing [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 99,416 | 88,506 | 271,181 | 230,640
Asia Pacific [Member] | Sales [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 73,997 | 80,966 | 202,115 | 211,437
Asia Pacific [Member] | Property Management [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 69,469 | 60,907 | 208,965 | 172,146
Asia Pacific [Member] | Valuation [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 26,744 | 28,515 | 83,598 | 86,220
Asia Pacific [Member] | Commercial Mortgage Origination [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 829 | 535 | 1,223 | 1,989
Asia Pacific [Member] | Loan Servicing [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 186 |  | 407 |
Asia Pacific [Member] | Other Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 2,506 | 1,936 | 8,485 | 6,479
Asia Pacific [Member] | Total Out of Scope of Topic 606 Revenue [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 2,692 | 1,936 | 8,892 | 6,479
Global Investment Management [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 93,061 | 92,122 | 315,698 | 274,451
Total revenue | 93,061 | 92,122 | 315,698 | 274,451
Global Investment Management [Member] | Investment Management [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 93,061 | 92,122 | 315,698 | 274,451
Development Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 25,753 | 16,111 | 67,486 | 47,294
Total revenue | 25,753 | 16,111 | 67,486 | 47,294
Development Services [Member] | Leasing [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 1,902 | 559 | 2,861 | 739
Development Services [Member] | Sales [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 95 | 270 | 513 | 965
Development Services [Member] | Property Management [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 2,718 | 2,337 | 6,379 | 7,345
Development Services [Member] | Development Services [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | $ 21,038 | $ 12,945 | $ 57,733 | $ 38,245

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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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