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Long-Term Debt - Summary of Future Maturities of Long-Term Debt (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Long Term Debt Rolling Maturity [Abstract]    
Due in 12 months following September 30, 2019 $ 10,064  
2020 1,166  
2021 144,963  
2022 1,258  
2023 1,297  
Thereafter 15,285  
Total $ 174,033 $ 264,995