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Revenue from Contracts with Customers - Disaggregation of Revenue from Contracts with Customers (Detail) - USD ($) $ in Thousands	12 Months Ended
	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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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.

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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).

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