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Revenue from Contracts with Customers - Disaggregation of Revenue from Contracts with Customers (Detail) - USD ($) $ in Thousands	3 Months Ended
	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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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
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-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

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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

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