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Operating Segment Information (Detail) - (Table 2) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Segment Reporting Information [Line Items]        
Domestic $ 346,867 $ 502,114 $ 848,847 $ 1,367,531
Domestic Destination [Member]        
Segment Reporting Information [Line Items]        
Domestic 297,641 431,043 741,708 1,203,453
Non-US [Member]        
Segment Reporting Information [Line Items]        
Domestic 49,226 71,071 107,139 164,078
Geographical [Member]        
Segment Reporting Information [Line Items]        
Domestic $ 63,655 $ 81,526 $ 181,639 $ 260,498