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Segments - Schedule of Investments in Unconsolidated Subsidiaries by Segment (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Segment Reporting Information [Line Items] |  |
Investments in Unconsolidated Subsidiaries | $ 216,174 | $ 238,001
Americas [Member] |  |
Segment Reporting Information [Line Items] |  |
Investments in Unconsolidated Subsidiaries | 41,446 | 39,105
EMEA [Member] |  |
Segment Reporting Information [Line Items] |  |
Investments in Unconsolidated Subsidiaries | 864 | 852
Asia Pacific [Member] |  |
Segment Reporting Information [Line Items] |  |
Investments in Unconsolidated Subsidiaries | 6,845 | 6,581
Global Investment Management [Member] |  |
Segment Reporting Information [Line Items] |  |
Investments in Unconsolidated Subsidiaries | 77,926 | 83,430
Development Services [Member] |  |
Segment Reporting Information [Line Items] |  |
Investments in Unconsolidated Subsidiaries | $ 89,093 | $ 108,033

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- Definition Amount of investment in equity method investee and investment in and advance to affiliate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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