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Segment Information - Operating Revenues by Geographic Area (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]    
Operating revenues $ 478,423 $ 416,780
United States [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Operating revenues 196,689 181,046
Other [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Operating revenues 20,173 17,756
Total Americas [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Operating revenues 216,862 198,802
United Kingdom [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Operating revenues 79,081 65,061
Other [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Operating revenues 106,194 87,929
Europe, the Middle East and Africa ("EMEA") [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Operating revenues 185,275 152,990
Japan [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Operating revenues 21,642 19,392
Other [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Operating revenues 54,644 45,596
Total Asia & Australia [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Operating revenues $ 76,286 $ 64,988