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Marketable Investments - Summary of Maturity Periods of the Marketable Investments (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
FY 2017 $ 24,934  
FY 2018 30,732  
FY 2019 4,751  
Total 60,417 $ 61,147
Federal Agency Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
FY 2018 1,795  
Total 1,795 1,793
Corporate Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
FY 2017 24,934  
FY 2018 28,937  
FY 2019 4,751  
Total $ 58,622 $ 59,354