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Segments - Schedule of Identifiable Assets by Segment (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Identifiable assets	$ 11,483,830	$ 10,779,587
Global Investment Management [Member]
Segment Reporting Information [Line Items]
Identifiable assets	1,075,691	913,563
Development Services [Member]
Segment Reporting Information [Line Items]
Identifiable assets	164,455	188,762
Corporate [Member]
Segment Reporting Information [Line Items]
Identifiable assets	749,750	816,791
Americas [Member]
Segment Reporting Information [Line Items]
Identifiable assets	5,599,820	5,555,400
EMEA [Member]
Segment Reporting Information [Line Items]
Identifiable assets	3,005,122	2,592,800
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Identifiable assets	$ 888,992	$ 712,271

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://www.xbrl.org/2003/role/presentationRef
-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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-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

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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