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Schedule of Outstanding Debt (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Secured long-term debt $ 99,689 $ 92,079
Less current portion (23,387) (19,619)
Total long-term debt 76,302 72,460
Secured Equipment Notes due in June 2020 [Member]    
Debt Instrument [Line Items]    
Equipment note 7,069  
Secured Equipment Notes due in March 2020 [Member]    
Debt Instrument [Line Items]    
Equipment note 2,222  
Secured Equipment Notes due in January 2020 [Member]    
Debt Instrument [Line Items]    
Equipment note 8,416  
Secured Equipment Notes due in December 2019 [Member]    
Debt Instrument [Line Items]    
Equipment note 12,115 13,387
Secured Equipment Notes due in November 2019 [Member]    
Debt Instrument [Line Items]    
Equipment note 25,260 28,429
Secured Equipment Notes due in September 2019 [Member]    
Debt Instrument [Line Items]    
Equipment note 20,483 22,772
Secured Equipment Notes due in February 2019 [Member]    
Debt Instrument [Line Items]    
Equipment note 18,547 21,016
Secured Equipment Notes due in June 2018 [Member]    
Debt Instrument [Line Items]    
Equipment note $ 5,577 $ 6,475