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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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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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