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Note 28 - Revenue - Disaggregated Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Revenues | $ 4,459,487 | $ 4,089,129
Lease Brokerage [Member] |  |
Revenues | 1,124,106 | 1,000,683
Capital Markets [Member] |  |
Revenues | 1,084,172 | 1,236,243
E&D and Project Management [Member] |  |
Revenues | 790,665 | 564,612
Property Management [Member] |  |
Revenues | 499,228 | 497,803
Valuation and Advisory [Member] |  |
Revenues | 477,719 | 447,484
Advisory [Member] |  |
Revenues | 348,604 | 217,864
Incentive Fees [Member] |  |
Revenues | 30,277 | 35,026
Other Revenue [Member] |  |
Revenues | 104,716 | 89,414
Americas Segment [Member] |  |
Revenues | 2,756,345 | 2,489,217
Americas Segment [Member] | Lease Brokerage [Member] |  |
Revenues | 851,621 | 729,050
Americas Segment [Member] | Capital Markets [Member] |  |
Revenues | 760,486 | 838,678
Americas Segment [Member] | E&D and Project Management [Member] |  |
Revenues | 518,214 | 363,281
Americas Segment [Member] | Property Management [Member] |  |
Revenues | 297,573 | 275,460
Americas Segment [Member] | Valuation and Advisory [Member] |  |
Revenues | 244,719 | 214,665
Americas Segment [Member] | Advisory [Member] |  |
Revenues | 0 | 0
Americas Segment [Member] | Incentive Fees [Member] |  |
Revenues | 0 | 0
Americas Segment [Member] | Other Revenue [Member] |  |
Revenues | 83,732 | 68,083
EMEA Segment [Member] |  |
Revenues | 715,140 | 672,737
EMEA Segment [Member] | Lease Brokerage [Member] |  |
Revenues | 147,473 | 145,422
EMEA Segment [Member] | Capital Markets [Member] |  |
Revenues | 161,454 | 190,525
EMEA Segment [Member] | E&D and Project Management [Member] |  |
Revenues | 191,378 | 123,927
EMEA Segment [Member] | Property Management [Member] |  |
Revenues | 70,148 | 72,564
EMEA Segment [Member] | Valuation and Advisory [Member] |  |
Revenues | 139,365 | 134,489
EMEA Segment [Member] | Advisory [Member] |  |
Revenues | 0 | 0
EMEA Segment [Member] | Incentive Fees [Member] |  |
Revenues | 0 | 0
EMEA Segment [Member] | Other Revenue [Member] |  |
Revenues | 5,322 | 5,810
Asia Pacific Segment [Member] |  |
Revenues | 608,460 | 673,661
Asia Pacific Segment [Member] | Lease Brokerage [Member] |  |
Revenues | 125,012 | 126,211
Asia Pacific Segment [Member] | Capital Markets [Member] |  |
Revenues | 162,232 | 207,040
Asia Pacific Segment [Member] | E&D and Project Management [Member] |  |
Revenues | 81,073 | 77,404
Asia Pacific Segment [Member] | Property Management [Member] |  |
Revenues | 131,507 | 149,779
Asia Pacific Segment [Member] | Valuation and Advisory [Member] |  |
Revenues | 93,635 | 98,323
Asia Pacific Segment [Member] | Advisory [Member] |  |
Revenues | 0 | 0
Asia Pacific Segment [Member] | Incentive Fees [Member] |  |
Revenues | 0 | 0
Asia Pacific Segment [Member] | Other Revenue [Member] |  |
Revenues | 15,001 | 14,904
Investment Management [Member] |  |
Revenues | 378,881 | 252,890
Investment Management [Member] | Lease Brokerage [Member] |  |
Revenues | 0 | 0
Investment Management [Member] | Capital Markets [Member] |  |
Revenues | 0 | 0
Investment Management [Member] | E&D and Project Management [Member] |  |
Revenues | 0 | 0
Investment Management [Member] | Property Management [Member] |  |
Revenues | 0 | 0
Investment Management [Member] | Valuation and Advisory [Member] |  |
Revenues | 0 | 0
Investment Management [Member] | Advisory [Member] |  |
Revenues | 348,604 | 217,864
Investment Management [Member] | Incentive Fees [Member] |  |
Revenues | 30,277 | 35,026
Investment Management [Member] | Other Revenue [Member] |  |
Revenues | 0 | 0
Corporate Segment [Member] |  |
Revenues | 661 | 624
Corporate Segment [Member] | Lease Brokerage [Member] |  |
Revenues | 0 | 0
Corporate Segment [Member] | Capital Markets [Member] |  |
Revenues | 0 | 0
Corporate Segment [Member] | E&D and Project Management [Member] |  |
Revenues | 0 | 0
Corporate Segment [Member] | Property Management [Member] |  |
Revenues | 0 | 0
Corporate Segment [Member] | Valuation and Advisory [Member] |  |
Revenues | 0 | 7
Corporate Segment [Member] | Advisory [Member] |  |
Revenues | 0 | 0
Corporate Segment [Member] | Incentive Fees [Member] |  |
Revenues | 0 | 0
Corporate Segment [Member] | Other Revenue [Member] |  |
Revenues | $ 661 | $ 617

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