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Operating Segment Information (Detail) - (Table 2) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Segment Reporting Information [Line Items]    
Domestic $ 359,168 $ 415,788
Domestic Destination [Member]    
Segment Reporting Information [Line Items]    
Domestic 317,937 368,433
Non-US [Member]    
Segment Reporting Information [Line Items]    
Domestic 41,231 47,355
Geographical [Member]    
Segment Reporting Information [Line Items]    
Domestic $ 68,325 $ 77,116