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Segments - Schedule of Investments in Unconsolidated Subsidiaries by Segment (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Investments in unconsolidated subsidiaries	$ 238,001	$ 232,238
Global Investment Management [Member]
Segment Reporting Information [Line Items]
Investments in unconsolidated subsidiaries	83,430	87,501
Development Services [Member]
Segment Reporting Information [Line Items]
Investments in unconsolidated subsidiaries	108,033	118,345
Americas [Member]
Segment Reporting Information [Line Items]
Investments in unconsolidated subsidiaries	39,105	20,202
EMEA [Member]
Segment Reporting Information [Line Items]
Investments in unconsolidated subsidiaries	852	388
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Investments in unconsolidated subsidiaries	$ 6,581	$ 5,802

X

- Definition

Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- 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.

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