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Note 25 - Revenue From Contracts With Customers - Disaggregated Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Revenues	$ 3,045,811	$ 2,825,427
Americas Segment [Member]
Revenues	1,690,507	1,596,184
EMEA Segment [Member]
Revenues	636,466	623,238
Asia Pacific Segment [Member]
Revenues	542,609	528,360
Investment Management [Member]
Revenues	174,588	76,021
Corporate Segment [Member]
Revenues	1,641	1,624
Lease Brokerage [Member]
Revenues	946,399	903,947
Lease Brokerage [Member] | Americas Segment [Member]
Revenues	691,149	648,815
Lease Brokerage [Member] | EMEA Segment [Member]
Revenues	139,141	139,685
Lease Brokerage [Member] | Asia Pacific Segment [Member]
Revenues	115,916	115,447
Lease Brokerage [Member] | Investment Management [Member]
Revenues	0	0
Lease Brokerage [Member] | Corporate Segment [Member]
Revenues	193	0
Sales Brokerage [Member]
Revenues	775,909	780,884
Sales Brokerage [Member] | Americas Segment [Member]
Revenues	424,703	441,934
Sales Brokerage [Member] | EMEA Segment [Member]
Revenues	192,673	168,796
Sales Brokerage [Member] | Asia Pacific Segment [Member]
Revenues	158,533	170,154
Sales Brokerage [Member] | Investment Management [Member]
Revenues	0	0
Sales Brokerage [Member] | Corporate Segment [Member]
Revenues		0
Property Management [Member]
Revenues	481,914	449,332
Property Management [Member] | Americas Segment [Member]
Revenues	263,126	228,550
Property Management [Member] | EMEA Segment [Member]
Revenues	75,751	84,861
Property Management [Member] | Asia Pacific Segment [Member]
Revenues	143,037	135,921
Property Management [Member] | Investment Management [Member]
Revenues	0	0
Property Management [Member] | Corporate Segment [Member]
Revenues		0
Valuation and Advisory [Member]
Revenues	346,464	323,034
Valuation and Advisory [Member] | Americas Segment [Member]
Revenues	167,919	148,721
Valuation and Advisory [Member] | EMEA Segment [Member]
Revenues	109,517	112,180
Valuation and Advisory [Member] | Asia Pacific Segment [Member]
Revenues	69,028	62,133
Valuation and Advisory [Member] | Investment Management [Member]
Revenues	0	0
Valuation and Advisory [Member] | Corporate Segment [Member]
Revenues		0
Project Management [Member]
Revenues	282,929	249,078
Project Management [Member] | Americas Segment [Member]
Revenues	124,991	109,699
Project Management [Member] | EMEA Segment [Member]
Revenues	113,792	107,149
Project Management [Member] | Asia Pacific Segment [Member]
Revenues	44,146	32,230
Project Management [Member] | Investment Management [Member]
Revenues	0	0
Project Management [Member] | Corporate Segment [Member]
Revenues	0	0
Advisory [Member]
Revenues	152,479	68,648
Advisory [Member] | Americas Segment [Member]
Revenues
Advisory [Member] | EMEA Segment [Member]
Revenues
Advisory [Member] | Asia Pacific Segment [Member]
Revenues
Advisory [Member] | Investment Management [Member]
Revenues	152,479	68,648
Advisory [Member] | Corporate Segment [Member]
Revenues
Incentive Fees [Member]
Revenues	19,162	6,330
Incentive Fees [Member] | Americas Segment [Member]
Revenues
Incentive Fees [Member] | EMEA Segment [Member]
Revenues
Incentive Fees [Member] | Asia Pacific Segment [Member]
Revenues
Incentive Fees [Member] | Investment Management [Member]
Revenues	19,162	6,330
Incentive Fees [Member] | Corporate Segment [Member]
Revenues
Transaction and Other [Member]
Revenues	2,947	1,043
Transaction and Other [Member] | Americas Segment [Member]
Revenues
Transaction and Other [Member] | EMEA Segment [Member]
Revenues
Transaction and Other [Member] | Asia Pacific Segment [Member]
Revenues
Transaction and Other [Member] | Investment Management [Member]
Revenues	2,947	1,043
Transaction and Other [Member] | Corporate Segment [Member]
Revenues
Other Revenue [Member]
Revenues	37,608	43,131
Other Revenue [Member] | Americas Segment [Member]
Revenues	18,619	18,465
Other Revenue [Member] | EMEA Segment [Member]
Revenues	5,592	10,567
Other Revenue [Member] | Asia Pacific Segment [Member]
Revenues	11,949	12,475
Other Revenue [Member] | Investment Management [Member]
Revenues
Other Revenue [Member] | Corporate Segment [Member]
Revenues	$ 1,448	$ 1,624

X

- Definition

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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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