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Segment Reporting - Information on Long-Lived Assets and Net Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Property and equipment, net | $ 84,577 | $ 75,075
United States |  |
Segment Reporting Information [Line Items] |  |
Property and equipment, net | 59,611 | 52,709
Net assets | 867,321 | 654,010
United Kingdom |  |
Segment Reporting Information [Line Items] |  |
Property and equipment, net | 14,023 | 14,761
Net assets | 160,894 | 207,885
All other foreign countries |  |
Segment Reporting Information [Line Items] |  |
Property and equipment, net | 10,943 | 7,605
Net assets | $ 320,610 | $ 330,076

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