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Schedule of Principal Payments (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
2017 (remainder) $ 2,500  
2018 10,000  
2019 15,000  
2020 802,000  
2021 0  
Thereafter 600,000  
Total debt $ 1,429,500 $ 1,455,000