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Segment, Geographic and Product Information - Geographic Information Regarding Revenues (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Revenues:        
Total revenues $ 455,039 $ 521,137 $ 1,577,294 $ 1,617,075
U.S. [Member]        
Revenues:        
Total revenues 113,548 134,230 402,903 426,221
U.K. [Member]        
Revenues:        
Total revenues 192,271 212,121 657,367 666,374
Asia [Member]        
Revenues:        
Total revenues 75,892 84,730 240,080 258,594
Other Europe/MEA [Member]        
Revenues:        
Total revenues 36,275 53,374 149,420 157,566
France [Member]        
Revenues:        
Total revenues 23,905 21,724 84,126 64,343
Other Americas [Member]        
Revenues:        
Total revenues $ 13,148 $ 14,958 $ 43,398 $ 43,977