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Schedule of Principal Payments (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
2016 (remainder) $ 3,750  
2017 10,000  
2018 10,000  
2019 15,000  
2020 779,000  
Thereafter 600,000  
Total debt $ 1,417,750 $ 1,464,000