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Long-Term Debt - Summary of Contractual Maturity Term Facility (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Contractual Obligation Fiscal Year Maturity Schedule [Abstract]  
2018 $ 17,514
2019 17,514
2020 17,514
2021 1,655,093
Long-term debt maturities, Total $ 1,707,635