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Operating Segment Information (Detail) - (Table 2) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Segment Reporting Information [Line Items]        
Domestic $ 458,482 $ 441,193 $ 1,243,249 $ 1,181,728
Geographical [Member]        
Segment Reporting Information [Line Items]        
Domestic 69,078 87,662 259,766 258,603
International [Member]        
Segment Reporting Information [Line Items]        
Domestic 65,414 52,843 152,688 119,861
Domestic [Member]        
Segment Reporting Information [Line Items]        
Domestic $ 393,068 $ 388,350 $ 1,090,561 $ 1,061,867