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Segments - Summarized Financial Information by Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Revenue	$ 14,209,608	$ 13,071,589	$ 10,855,810
Depreciation and amortization	406,114	366,927	314,096
Equity income from unconsolidated subsidiaries	210,207	197,351	162,849
Adjusted EBITDA	1,709,534	1,561,003	1,412,724
Global Investment Management [Member]
Segment Reporting Information [Line Items]
Revenue	377,644	369,800	460,700
Depreciation and amortization	24,123	25,911	29,020
Equity income from unconsolidated subsidiaries	7,923	7,243	5,972
Adjusted EBITDA	94,373	83,151	134,240
Development Services [Member]
Segment Reporting Information [Line Items]
Revenue	77,627	71,414	65,643
Depreciation and amortization	2,073	2,469	2,218
Equity income from unconsolidated subsidiaries	181,545	170,176	136,447
Adjusted EBITDA	119,654	113,937	90,066
Americas [Member]
Segment Reporting Information [Line Items]
Revenue	7,860,239	7,246,459	6,201,676
Depreciation and amortization	289,338	254,118	198,986
Equity income from unconsolidated subsidiaries	18,789	17,892	18,413
Adjusted EBITDA	1,013,864	950,355	858,174
EMEA [Member]
Segment Reporting Information [Line Items]
Revenue	4,164,789	3,884,596	2,984,312
Depreciation and amortization	72,322	66,619	68,263
Equity income from unconsolidated subsidiaries	1,553	1,817	1,934
Adjusted EBITDA	305,743	271,648	212,687
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Revenue	1,729,309	1,499,320	1,143,479
Depreciation and amortization	18,258	17,810	15,609
Equity income from unconsolidated subsidiaries	397	223	83
Adjusted EBITDA	$ 175,900	$ 141,912	$ 117,557

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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