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Operating Segment Information (Detail) - (Table 2) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2017
Sep. 30, 2016
Mar. 31, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Segment Reporting Information [Line Items]            
Domestic $ 366,387   $ 329,357      
Geographical [Member]            
Segment Reporting Information [Line Items]            
Domestic   $ 84,570   $ 82,603 $ 254,843 $ 252,942
International [Member]            
Segment Reporting Information [Line Items]            
Domestic 33,795   30,061      
Domestic [Member]            
Segment Reporting Information [Line Items]            
Domestic $ 332,592   $ 299,296