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Operating Segment Information (Detail) - (Table 2) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Segment Reporting Information [Line Items]        
Domestic $ 323,582 $ 295,715 $ 647,527 $ 600,339
Geographical [Member]        
Segment Reporting Information [Line Items]        
Domestic 80,058 76,632 158,185 159,320
International [Member]        
Segment Reporting Information [Line Items]        
Domestic 37,139 26,278 72,953 49,520
Domestic [Member]        
Segment Reporting Information [Line Items]        
Domestic $ 286,443 $ 269,437 $ 574,574 $ 550,819