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Principal Payments on New Term Loan (Detail) - USD ($)
$ in Thousands
Jun. 15, 2016
Apr. 30, 2016
Term Facility    
Line of Credit Facility [Line Items]    
Long-term debt   $ 140,000
Subsequent Event    
Line of Credit Facility [Line Items]    
Long-term debt $ 275,000  
Subsequent Event | Term Facility    
Line of Credit Facility [Line Items]    
2017 15,469  
2018 20,625  
2019 25,781  
2020 27,500  
2021 27,500  
Thereafter $ 158,125