Annual report pursuant to Section 13 and 15(d)

Long Term Debt (Parenthetical) (Detail)

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Long Term Debt (Parenthetical) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Debt Disclosure [Abstract]    
Debt issue costs, accumulated amortization $ 25,549 $ 19,364