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Segments - Schedule of Identifiable Assets by Segment (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Identifiable Assets	$ 13,456,793	$ 11,718,396
Operating Segments [Member] | Americas [Member]
Segment Reporting Information [Line Items]
Identifiable Assets	7,432,532	5,808,332
Operating Segments [Member] | EMEA [Member]
Segment Reporting Information [Line Items]
Identifiable Assets	3,168,050	3,013,586
Operating Segments [Member] | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Identifiable Assets	978,331	894,066
Operating Segments [Member] | Global Investment Management [Member]
Segment Reporting Information [Line Items]
Identifiable Assets	1,018,999	1,075,691
Operating Segments [Member] | Development Services [Member]
Segment Reporting Information [Line Items]
Identifiable Assets	166,864	176,971
Corporate [Member]
Segment Reporting Information [Line Items]
Identifiable Assets	$ 692,017	$ 749,750

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(11))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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- Definition

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+ References

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