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Segments - Summarized Financial Information by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Revenue	$ 6,798,327	$ 5,645,142	$ 19,195,819	$ 16,915,694
Total reportable segment operating profit	854,899	518,906	2,187,865	1,356,114
Corporate, other and eliminations
Segment Reporting Information [Line Items]
Revenue	(4,795)	(5,758)	(15,397)	(20,168)
Total reportable segment operating profit	118,830	77,142	242,281	216,695
Advisory Services | Operating Segments
Segment Reporting Information [Line Items]
Revenue	2,412,147	1,630,010	6,257,144	4,886,929
Total reportable segment operating profit	521,539	286,655	1,318,136	821,731
Global Workplace Solutions | Operating Segments
Segment Reporting Information [Line Items]
Revenue	4,167,143	3,851,278	12,275,748	11,506,240
Total reportable segment operating profit	187,315	160,829	509,644	395,286
Real Estate Investments | Operating Segments
Segment Reporting Information [Line Items]
Revenue	223,832	169,612	678,324	542,693
Total reportable segment operating profit	$ 146,045	$ 71,422	$ 360,085	$ 139,097

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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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