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Long-Term Debt - Schedule of Interest Expense Related to Long-Term Debt (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Interest Expense, Debt [Abstract]      
Contractual interest $ 7,315 $ 7,211 $ 7,201
Non-cash expense 3,529 3,543 3,252
Total interest expense related to long-term debt $ 10,844 $ 10,754 $ 10,453