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Operating Segment Information (Detail) - (Table 2) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Segment Reporting Information [Line Items]    
Domestic $ 361,025 $ 359,168
Domestic Destination [Member]    
Segment Reporting Information [Line Items]    
Domestic 315,601 317,937
Non-US [Member]    
Segment Reporting Information [Line Items]    
Domestic 45,424 41,231
Geographical [Member]    
Segment Reporting Information [Line Items]    
Domestic $ 75,291 $ 68,325