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Segments - Summarized Financial Information by Segment (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]      
Revenue $ 21,340,088 $ 18,628,787 $ 17,369,108
Depreciation and amortization 451,988 406,114 366,927
Equity income from unconsolidated subsidiaries 324,664 210,207 197,351
Adjusted EBITDA 1,905,168 1,716,774 1,562,347
Americas [Member]      
Segment Reporting Information [Line Items]      
Revenue 13,131,906 11,791,377 11,069,965
Depreciation and amortization 327,556 289,338 254,118
Equity income from unconsolidated subsidiaries 14,177 18,789 17,892
Adjusted EBITDA 1,111,014 1,011,643 950,573
EMEA [Member]      
Segment Reporting Information [Line Items]      
Revenue 5,465,923 4,396,825 4,128,906
Depreciation and amortization 80,290 72,322 66,619
Equity income from unconsolidated subsidiaries 1,523 1,553 1,817
Adjusted EBITDA 329,522 309,233 272,894
Asia Pacific [Member]      
Segment Reporting Information [Line Items]      
Revenue 2,207,535 1,983,486 1,729,528
Depreciation and amortization 20,297 18,258 17,810
Equity income from unconsolidated subsidiaries 433 397 223
Adjusted EBITDA 197,684 180,043 142,299
Global Investment Management [Member]      
Segment Reporting Information [Line Items]      
Revenue 434,405 377,644 369,800
Depreciation and amortization 23,017 24,123 25,911
Equity income from unconsolidated subsidiaries 6,131 7,923 7,243
Adjusted EBITDA 78,469 94,373 83,150
Development Services [Member]      
Segment Reporting Information [Line Items]      
Revenue 100,319 79,455 70,909
Depreciation and amortization 828 2,073 2,469
Equity income from unconsolidated subsidiaries 302,400 181,545 170,176
Adjusted EBITDA $ 188,479 $ 121,482 $ 113,431