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Segment Information - Long-Lived Assets by Geographic Area (Detail) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets $ 285,522 $ 289,806
United States [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets 180,605 182,776
Other [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets 14,852 13,949
Total Americas [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets 195,457 196,725
United Kingdom [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets 19,508 19,678
Other [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets 33,101 33,561
Total EMEA [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets 52,609 53,239
Japan [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets 1,621 1,896
Other [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets 35,835 37,946
Total Asia & Australia [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets $ 37,456 $ 39,842