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Operating Segment Information (Detail) - (Table 2) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Segment Reporting Information [Line Items]        
Domestic $ 441,193 $ 408,384 $ 1,181,728 $ 1,063,143
Geographical [Member]        
Segment Reporting Information [Line Items]        
Domestic 87,662 86,584 258,603 252,599
International [Member]        
Segment Reporting Information [Line Items]        
Domestic 52,843 47,984 119,861 106,176
Domestic [Member]        
Segment Reporting Information [Line Items]        
Domestic $ 388,350 $ 360,400 $ 1,061,867 $ 956,967