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Segments - Summarized Financial Information by Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Segment Reporting Information [Line Items] |  |
Revenue | $ 5,938,879 | $ 5,889,168
Total reportable segment operating profit | 545,054 | 482,953
Corporate, other and eliminations |  |
Segment Reporting Information [Line Items] |  |
Revenue | (6,145) | (9,518)
Total reportable segment operating profit | 53,910 | 52,602
Advisory Services | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Revenue | 1,708,012 | 1,802,687
Total reportable segment operating profit | 332,300 | 332,965
Global Workplace Solutions | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Revenue | 4,025,883 | 3,884,529
Total reportable segment operating profit | 152,177 | 106,967
Real Estate Investments | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Revenue | 211,129 | 211,470
Total reportable segment operating profit | 60,577 | 43,021
Real Estate Investments | Corporate, other and eliminations |  |
Segment Reporting Information [Line Items] |  |
Revenue | $ (6,145) | $ (9,518)

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- Definition Adjusted EBITDA represents earnings before net interest expense, write-off of financing costs on extinguished debt, income taxes, depreciation and amortization, and is further adjusted for the impact of certain cash and non-cash charges related to acquisitions, cost-elimination expenses and certain carried interest incentive compensation (reversal) expense to align with the timing of associated revenue. + References No definition available. + Details
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