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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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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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