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Long-Term Debt - Schedule of Maturities of Long-Term Debt (Detail)
$ in Thousands
Dec. 31, 2018
USD ($)
Debt Disclosure [Abstract]  
2019 $ 12,552
2020 5,544
2021 3,239
2022 12,025
2023 406,801
Less: Discount and debt issuance costs 14,962
Long-term debt $ 425,199