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Segments and Geographic Information - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]      
Revenues $ 3,155,671 $ 3,785,063 $ 3,707,628
UNITED STATES [Member]      
Segment Reporting Information [Line Items]      
Revenues $ 2,700,000 $ 3,100,000 $ 3,000,000