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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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation Of Revenue [Line Items]
Topic 606 Revenue	$ 5,487,176	$ 5,760,025	$ 16,484,546	$ 16,322,726
Out of Scope of Topic 606 Revenue	157,966	165,076	431,148	451,958
Total revenue	5,645,142	5,925,101	16,915,694	16,774,684
Advisory Services [Member]
Disaggregation Of Revenue [Line Items]
Topic 606 Revenue	1,597,026	2,075,636	4,822,642	5,802,114
Out of Scope of Topic 606 Revenue	157,139	165,076	415,976	451,958
Total revenue	1,754,165	2,240,712	5,238,618	6,254,072
Global Workplace Solutions [Member]
Disaggregation Of Revenue [Line Items]
Topic 606 Revenue	3,721,365	3,555,176	11,134,383	10,106,543
Total revenue	3,721,365	3,555,176	11,134,383	10,106,543
Real Estate Investments [Member]
Disaggregation Of Revenue [Line Items]
Topic 606 Revenue	168,785	129,213	527,521	414,069
Out of Scope of Topic 606 Revenue	827		15,172
Total revenue	169,612	129,213	542,693	414,069
Global Workplace Solutions [Member]
Disaggregation Of Revenue [Line Items]
Topic 606 Revenue	3,721,365	3,555,176	11,134,383	10,106,543
Global Workplace Solutions [Member] | Global Workplace Solutions [Member]
Disaggregation Of Revenue [Line Items]
Topic 606 Revenue	3,721,365	3,555,176	11,134,383	10,106,543
Advisory Leasing [Member]
Disaggregation Of Revenue [Line Items]
Topic 606 Revenue	536,132	781,246	1,653,367	2,221,674
Advisory Leasing [Member] | Advisory Services [Member]
Disaggregation Of Revenue [Line Items]
Topic 606 Revenue	536,132	781,246	1,653,367	2,221,674
Advisory Sales [Member]
Disaggregation Of Revenue [Line Items]
Topic 606 Revenue	346,650	526,104	1,018,853	1,378,317
Advisory Sales [Member] | Advisory Services [Member]
Disaggregation Of Revenue [Line Items]
Topic 606 Revenue	346,650	526,104	1,018,853	1,378,317
Property and Advisory Project Management [Member]
Disaggregation Of Revenue [Line Items]
Topic 606 Revenue	545,325	558,039	1,623,486	1,634,745
Property and Advisory Project Management [Member] | Advisory Services [Member]
Disaggregation Of Revenue [Line Items]
Topic 606 Revenue	545,325	558,039	1,623,486	1,634,745
Valuation [Member]
Disaggregation Of Revenue [Line Items]
Topic 606 Revenue	139,019	154,861	418,616	442,238
Valuation [Member] | Advisory Services [Member]
Disaggregation Of Revenue [Line Items]
Topic 606 Revenue	139,019	154,861	418,616	442,238
Commercial Mortgage Origination [Member]
Disaggregation Of Revenue [Line Items]
Topic 606 Revenue	20,040	46,787	78,030	102,471
Out of Scope of Topic 606 Revenue	108,986	117,052	274,523	322,246
Commercial Mortgage Origination [Member] | Advisory Services [Member]
Disaggregation Of Revenue [Line Items]
Topic 606 Revenue	20,040	46,787	78,030	102,471
Out of Scope of Topic 606 Revenue	108,986	117,052	274,523	322,246
Loan Servicing [Member]
Disaggregation Of Revenue [Line Items]
Topic 606 Revenue	9,860	8,599	30,290	22,669
Out of Scope of Topic 606 Revenue	48,153	48,024	141,453	129,712
Loan Servicing [Member] | Advisory Services [Member]
Disaggregation Of Revenue [Line Items]
Topic 606 Revenue	9,860	8,599	30,290	22,669
Out of Scope of Topic 606 Revenue	48,153	48,024	141,453	129,712
Investment Management [Member]
Disaggregation Of Revenue [Line Items]
Topic 606 Revenue	99,935	104,927	324,745	312,881
Investment Management [Member] | Real Estate Investments [Member]
Disaggregation Of Revenue [Line Items]
Topic 606 Revenue	99,935	104,927	324,745	312,881
Development Services [Member]
Disaggregation Of Revenue [Line Items]
Topic 606 Revenue	68,850	24,286	202,776	101,188
Out of Scope of Topic 606 Revenue	827		15,172
Development Services [Member] | Real Estate Investments [Member]
Disaggregation Of Revenue [Line Items]
Topic 606 Revenue	68,850	$ 24,286	202,776	$ 101,188
Out of Scope of Topic 606 Revenue	$ 827		$ 15,172

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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 that is not accounted for under Topic 606.

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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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