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Segments - Summarized Financial Information by Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Revenue	$ 23,894,091	$ 21,340,088	$ 18,628,787
Depreciation and amortization	439,224	451,988	406,114
Equity income (loss) from unconsolidated subsidiaries	160,925	324,664	210,207
Adjusted EBITDA	2,063,783	1,905,168	1,716,774
Advisory Services [Member]
Segment Reporting Information [Line Items]
Revenue	9,069,468	8,440,002	7,379,725
Depreciation and amortization	304,766	280,921	243,791
Equity income (loss) from unconsolidated subsidiaries	6,894	16,017	20,740
Adjusted EBITDA	1,465,792	1,303,251	1,174,943
Global Workspace Solutions [Member]
Segment Reporting Information [Line Items]
Revenue	14,164,001	12,365,362	10,791,963
Depreciation and amortization	120,975	147,222	136,127
Equity income (loss) from unconsolidated subsidiaries	(1,423)	115
Adjusted EBITDA	424,026	345,560	334,377
Real Estate Investments [Member]
Segment Reporting Information [Line Items]
Revenue	660,622	534,724	457,099
Depreciation and amortization	13,483	23,845	26,196
Equity income (loss) from unconsolidated subsidiaries	155,454	308,532	189,467
Adjusted EBITDA	$ 173,965	$ 256,357	$ 207,454

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