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Segment Information - Revenue by Geographic Area (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]        
Operating revenues $ 409,616 $ 385,558 $ 826,396 $ 756,939
United States [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Operating revenues 175,819 173,228 356,865 339,414
Other [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Operating revenues 16,891 16,808 34,647 32,791
Total Americas [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Operating revenues 192,710 190,036 391,512 372,205
United Kingdom [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Operating revenues 62,826 58,921 127,887 114,128
Other [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Operating revenues 90,209 81,088 178,138 157,723
Europe, the Middle East and Africa ("EMEA") [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Operating revenues 153,035 140,009 306,025 271,851
Japan [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Operating revenues 19,725 16,719 39,117 34,667
Other [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Operating revenues 44,146 38,794 89,742 78,216
Total Asia & Australia [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Operating revenues $ 63,871 $ 55,513 $ 128,859 $ 112,883