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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