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Schedule of Outstanding Debt (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Secured long-term debt $ 144,330 $ 133,304
Less current portion (39,769) (32,409)
Total long-term debt 104,561 100,895
Secured Equipment Notes due in 2021 [Member]    
Debt Instrument [Line Items]    
Secured long-term debt 35,269  
Secured Equipment Notes due in 2020 [Member]    
Debt Instrument [Line Items]    
Secured long-term debt 51,880 61,206
Secured Equipment Notes due in 2019 [Member]    
Debt Instrument [Line Items]    
Secured long-term debt 53,971 67,486
Secured Equipment Notes due in June 2018 [Member]    
Debt Instrument [Line Items]    
Secured long-term debt $ 3,210 $ 4,612