Annual report pursuant to Section 13 and 15(d)

Maturities of Long-Term Debt, Excluding Unamortized Debt Issuance Costs (Detail)

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Maturities of Long-Term Debt, Excluding Unamortized Debt Issuance Costs (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Debt Disclosure [Abstract]    
2018 $ 7,099  
2019 7,099  
2020 5,710  
2021 5,710  
2022 1,036,677  
Thereafter 755,000  
Total $ 1,817,295 $ 1,822,966