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Schedule of Outstanding Debt (Parenthetical) (Detail) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Secured Equipment Notes due in June 2020 [Member]    
Debt Instrument [Line Items]    
Equipment notes due Jun. 30, 2020  
Monthly payments $ 100  
Equipment notes, date of first required payment Jul. 31, 2015  
Interest rate secured debt 2.14%  
Payment Frequency Monthly  
Secured Equipment Notes due in March 2020 [Member]    
Debt Instrument [Line Items]    
Equipment notes due Mar. 31, 2020  
Monthly payments $ 40  
Equipment notes, date of first required payment Apr. 30, 2015  
Interest rate secured debt 2.14%  
Payment Frequency Monthly  
Secured Equipment Notes due in January 2020 [Member]    
Debt Instrument [Line Items]    
Equipment notes due Jan. 31, 2020  
Monthly payments $ 200  
Equipment notes, date of first required payment Feb. 28, 2015  
Payment Frequency Monthly  
Lower interest rate paid at a fixed rate 1.72%  
Upper interest rate paid at a fixed rate 2.26%  
Secured Equipment Notes due in December 2019 [Member]    
Debt Instrument [Line Items]    
Equipment notes due Dec. 31, 2019 Dec. 31, 2019
Monthly payments $ 200 $ 200
Equipment notes, date of first required payment Jan. 31, 2015 Jan. 31, 2015
Interest rate secured debt 2.24% 2.24%
Payment Frequency Monthly Monthly
Secured Equipment Notes due in November 2019 [Member]    
Debt Instrument [Line Items]    
Equipment notes due Nov. 30, 2019 Nov. 30, 2019
Monthly payments $ 500 $ 500
Equipment notes, date of first required payment Dec. 31, 2014 Dec. 31, 2014
Interest rate secured debt 2.05% 2.05%
Payment Frequency Monthly Monthly
Secured Equipment Notes due in September 2019 [Member]    
Debt Instrument [Line Items]    
Equipment notes due Sep. 30, 2019 Sep. 30, 2019
Monthly payments $ 400 $ 400
Equipment notes, date of first required payment Sep. 30, 2014 Sep. 30, 2014
Interest rate secured debt 2.15% 2.15%
Payment Frequency Monthly Monthly
Secured Equipment Notes due in February 2019 [Member]    
Debt Instrument [Line Items]    
Equipment notes due Feb. 28, 2019 Feb. 28, 2019
Monthly payments $ 400 $ 400
Equipment notes, date of first required payment Jan. 31, 2014 Jan. 31, 2014
Payment Frequency Monthly Monthly
Lower interest rate paid at a fixed rate 1.87% 1.87%
Upper interest rate paid at a fixed rate 1.93% 1.93%
Secured Equipment Notes due in June 2018 [Member]    
Debt Instrument [Line Items]    
Equipment notes due Jun. 30, 2018 Jun. 30, 2018
Monthly payments $ 500 $ 500
Equipment notes, date of first required payment Aug. 31, 2013 Aug. 31, 2013
Payment Frequency Quarterly Quarterly
Lower interest rate paid at a fixed rate 1.90% 1.90%
Upper interest rate paid at a fixed rate 2.00% 2.00%