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Segment and Geographic Information - Information Regarding Long-Lived Assets in Geographic Areas (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Long-lived assets:    
Total long-lived assets $ 1,836,708 $ 1,802,853
United States [Member]    
Long-lived assets:    
Total long-lived assets 1,419,107 1,373,118
United Kingdom [Member]    
Long-lived assets:    
Total long-lived assets 330,683 352,232
Asia [Member]    
Long-lived assets:    
Total long-lived assets 38,207 32,603
Other Europe/MEA [Member]    
Long-lived assets:    
Total long-lived assets 12,235 10,477
France [Member]    
Long-lived assets:    
Total long-lived assets 9,163 7,373
Other Americas [Member]    
Long-lived assets:    
Total long-lived assets $ 27,313 $ 27,050