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Segment Operating Results Revenues Derived from Clients and Private Equity Funds by Geographical Areas (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Segment Reporting Information [Line Items] |  |  |  |
Net revenue | $ 385,592 | $ 309,373 | $ 994,076 | $ 820,147
United States [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenue | 322,128 | 238,231 | 714,983 | 603,239
Europe And Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenue | 54,690 | 61,838 | 247,371 | 189,976
Latin America [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenue | $ 8,774 | $ 9,304 | $ 31,722 | $ 26,932

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