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Segments - Summarized Financial Information by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Revenue	$ 6,458,613	$ 5,381,384	$ 12,397,492	$ 11,270,552
Total reportable segment operating profit	787,912	354,256	1,332,966	837,208
Corporate, other and eliminations
Segment Reporting Information [Line Items]
Revenue	(4,457)	(4,892)	(10,602)	(14,410)
Total reportable segment operating profit	69,541	86,952	123,451	139,553
Advisory Services | Operating Segments
Segment Reporting Information [Line Items]
Revenue	2,136,985	1,454,232	3,844,997	3,256,919
Total reportable segment operating profit	464,297	202,112	796,597	535,076
Global Workplace Solutions | Operating Segments
Segment Reporting Information [Line Items]
Revenue	4,082,722	3,770,433	8,108,605	7,654,962
Total reportable segment operating profit	170,152	127,490	322,329	234,457
Real Estate Investments | Operating Segments
Segment Reporting Information [Line Items]
Revenue	243,363	161,611	454,492	373,081
Total reportable segment operating profit	$ 153,463	$ 24,654	$ 214,040	$ 67,675

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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.

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