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Long-Term Debt - Schedule of Maturities of Long-Term Debt (Parenthetical) (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Debt Disclosure [Abstract]  
2018 $ 9,146
2019 387,492
2020 5,507
2021 3,198
2022 1,980
Thereafter 6,765
Less: Discount and debt issuance costs 4,689
Long-term debt $ 409,399