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Note 27 - Revenue - Disaggregated Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Revenues | $ 4,335,141 | $ 4,459,487
Lease Brokerage [Member] |  |
Revenues | 1,063,088 | 1,124,106
Capital Markets [Member] |  |
Revenues | 702,472 | 1,084,172
E&D and Project Management [Member] |  |
Revenues | 1,002,405 | 790,665
Property Management [Member] |  |
Revenues | 527,740 | 499,228
Valuation and Advisory [Member] |  |
Revenues | 436,941 | 477,719
Advisory [Member] |  |
Revenues | 480,674 | 348,604
Incentive Fees [Member] |  |
Revenues | 6,783 | 30,277
Other Revenue [Member] |  |
Revenues | 115,038 | 104,716
Americas Segment [Member] |  |
Revenues | 2,510,002 | 2,756,345
Americas Segment [Member] | Lease Brokerage [Member] |  |
Revenues | 788,132 | 851,621
Americas Segment [Member] | Capital Markets [Member] |  |
Revenues | 481,226 | 760,486
Americas Segment [Member] | E&D and Project Management [Member] |  |
Revenues | 644,303 | 518,214
Americas Segment [Member] | Property Management [Member] |  |
Revenues | 323,437 | 297,573
Americas Segment [Member] | Valuation and Advisory [Member] |  |
Revenues | 187,178 | 244,719
Americas Segment [Member] | Advisory [Member] |  |
Revenues | 0 | 0
Americas Segment [Member] | Incentive Fees [Member] |  |
Revenues | 0 | 0
Americas Segment [Member] | Other Revenue [Member] |  |
Revenues | 85,726 | 83,732
EMEA Segment [Member] |  |
Revenues | 726,900 | 715,140
EMEA Segment [Member] | Lease Brokerage [Member] |  |
Revenues | 140,111 | 147,473
EMEA Segment [Member] | Capital Markets [Member] |  |
Revenues | 101,494 | 161,454
EMEA Segment [Member] | E&D and Project Management [Member] |  |
Revenues | 245,429 | 191,378
EMEA Segment [Member] | Property Management [Member] |  |
Revenues | 82,950 | 70,148
EMEA Segment [Member] | Valuation and Advisory [Member] |  |
Revenues | 148,526 | 139,365
EMEA Segment [Member] | Advisory [Member] |  |
Revenues | 0 | 0
EMEA Segment [Member] | Incentive Fees [Member] |  |
Revenues | 0 | 0
EMEA Segment [Member] | Other Revenue [Member] |  |
Revenues | 8,390 | 5,322
Asia Pacific Segment [Member] |  |
Revenues | 610,313 | 608,460
Asia Pacific Segment [Member] | Lease Brokerage [Member] |  |
Revenues | 134,845 | 125,012
Asia Pacific Segment [Member] | Capital Markets [Member] |  |
Revenues | 119,752 | 162,232
Asia Pacific Segment [Member] | E&D and Project Management [Member] |  |
Revenues | 112,673 | 81,073
Asia Pacific Segment [Member] | Property Management [Member] |  |
Revenues | 121,353 | 131,507
Asia Pacific Segment [Member] | Valuation and Advisory [Member] |  |
Revenues | 101,237 | 93,635
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 | 20,453 | 15,001
Investment Management [Member] |  |
Revenues | 487,457 | 378,881
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 | 480,674 | 348,604
Investment Management [Member] | Incentive Fees [Member] |  |
Revenues | 6,783 | 30,277
Investment Management [Member] | Other Revenue [Member] |  |
Revenues | 0 | 0
Corporate Segment [Member] |  |
Revenues | 469 | 661
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 | 0
Corporate Segment [Member] | Advisory [Member] |  |
Revenues | 0 | 0
Corporate Segment [Member] | Incentive Fees [Member] |  |
Revenues | 0 | 0
Corporate Segment [Member] | Other Revenue [Member] |  |
Revenues | $ 469 | $ 661

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