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Schedule of Outstanding Debt (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Secured long-term debt $ 133,304 $ 92,079
Less current portion (32,409) (19,619)
Total long-term debt 100,895 72,460
Secured Equipment Notes due in December 2020 [Member]    
Debt Instrument [Line Items]    
Equipment note 33,066  
Secured Equipment Notes due in September 2020 [Member]    
Debt Instrument [Line Items]    
Equipment note 12,214  
Secured Equipment Notes due in July 2020 [Member]    
Debt Instrument [Line Items]    
Equipment note 6,395  
Secured Equipment Notes due in March 2020 [Member]    
Debt Instrument [Line Items]    
Equipment note 1,998  
Secured Equipment Notes due in January 2020 [Member]    
Debt Instrument [Line Items]    
Equipment note 7,533  
Secured Equipment Notes due in December 2019 [Member]    
Debt Instrument [Line Items]    
Equipment note 10,828 13,387
Secured Equipment Notes due in November 2019 [Member]    
Debt Instrument [Line Items]    
Equipment note 22,514 28,429
Secured Equipment Notes due in September 2019 [Member]    
Debt Instrument [Line Items]    
Equipment note 18,170 22,772
Secured Equipment Notes due in February 2019 [Member]    
Debt Instrument [Line Items]    
Equipment note 15,974 21,016
Secured Equipment Notes due in June 2018 [Member]    
Debt Instrument [Line Items]    
Equipment note $ 4,612 $ 6,475