Annual report pursuant to Section 13 and 15(d)

Long-Term Debt and Notes Payable - Principal Maturities of Long-Term Debt (Detail)

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Long-Term Debt and Notes Payable - Principal Maturities of Long-Term Debt (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Maturities of Long-term Debt and Capital Lease Obligations [Abstract]    
2018 $ 2,689 $ 2,636
2019 1,957  
2020 2,142  
2021 2,066  
2022 913  
Thereafter 262,000  
Long-term debt and capital lease obligations $ 271,767 $ 148,120