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Operating Segment Information (Detail) - (Table 2) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Segment Reporting Information [Line Items]        
Domestic $ 413,462 $ 391,992 $ 1,060,989 $ 992,331
Geographical [Member]        
Segment Reporting Information [Line Items]        
Domestic 82,637 76,632 240,822 159,320
International [Member]        
Segment Reporting Information [Line Items]        
Domestic 50,987 34,643 125,785 84,163
Domestic [Member]        
Segment Reporting Information [Line Items]        
Domestic $ 362,475 $ 357,349 $ 935,204 $ 908,168