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Schedule of Long-Lived Assets by Geographic Area (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets $ 449,369 $ 377,755
UNITED STATES    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets 291,234 252,812
Foreign    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets [1] $ 158,135 $ 124,943
[1] As of December 31, 2020 and 2019, long-lived assets attributable to Singapore were $62.5 million and $35.2 million, respectively.