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Operating Segment Information (Detail) - (Table 2) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Segment Reporting Information [Line Items]        
Domestic $ 408,384 $ 413,462 $ 1,063,143 $ 1,060,989
Geographical [Member]        
Segment Reporting Information [Line Items]        
Domestic 84,570 82,603 254,843 252,942
International [Member]        
Segment Reporting Information [Line Items]        
Domestic 47,765 45,382 105,784 107,838
Domestic [Member]        
Segment Reporting Information [Line Items]        
Domestic $ 360,619 $ 368,080 $ 957,359 $ 953,151