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Operating Segment Information (Detail) - (Table 2) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Segment Reporting Information [Line Items]        
Domestic $ 374,148 $ 325,402 $ 740,535 $ 654,759
Geographical [Member]        
Segment Reporting Information [Line Items]        
Domestic 86,891 74,379 170,941 166,015
International [Member]        
Segment Reporting Information [Line Items]        
Domestic 31,675 28,123 66,666 58,192
Domestic [Member]        
Segment Reporting Information [Line Items]        
Domestic $ 342,473 $ 297,279 $ 673,869 $ 596,567