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Maturity Profile of Term Loan Net of Debt Amortization Expense (Detail) - Term Loan Credit Facility - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
2017 $ 19,613  
2018 39,226  
2019 39,272  
2020 619,654  
Total $ 717,765 $ 737,333