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Segments - Schedule of Capital Expenditures by Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Capital expenditures	$ 178,042	$ 191,205	$ 139,464
Global Investment Management [Member]
Segment Reporting Information [Line Items]
Capital expenditures	2,776	2,273	3,558
Development Services [Member]
Segment Reporting Information [Line Items]
Capital expenditures	55	255	527
Americas [Member]
Segment Reporting Information [Line Items]
Capital expenditures	127,135	134,046	94,376
EMEA [Member]
Segment Reporting Information [Line Items]
Capital expenditures	28,716	35,452	33,092
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Capital expenditures	$ 19,360	$ 19,179	$ 7,911

X

- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585

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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.

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