Summary of Significant Accounting Policies - Assumptions Used to Value Options Granted (Detail) - $ / shares
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Schedule Of Net Revenue Attributable To Medicaid Medicare Insurance And Self Pay As Percentage Of Net Air Medical Revenues [Line Items]      
Exercise Price $ 0.01    
Employees [Member]      
Schedule Of Net Revenue Attributable To Medicaid Medicare Insurance And Self Pay As Percentage Of Net Air Medical Revenues [Line Items]      
Expected term   4 years 9 months 4 years 9 months
Dividend yield 0.00% 0.00% 0.00%
Non Employees [Member]      
Schedule Of Net Revenue Attributable To Medicaid Medicare Insurance And Self Pay As Percentage Of Net Air Medical Revenues [Line Items]      
Expected term 7 years 0 years 0 years
Dividend yield 0.00% 0.00% 0.00%
Minimum [Member] | Employees [Member]      
Schedule Of Net Revenue Attributable To Medicaid Medicare Insurance And Self Pay As Percentage Of Net Air Medical Revenues [Line Items]      
Risk free interest rate 0.87% 0.93% 0.71%
Expected term 4 years 6 months 22 days    
Dividend yield 0.00% 0.00% 0.00%
Expected volatility 76.86% 78.27% 96.52%
Minimum [Member] | Non Employees [Member]      
Schedule Of Net Revenue Attributable To Medicaid Medicare Insurance And Self Pay As Percentage Of Net Air Medical Revenues [Line Items]      
Risk free interest rate 1.47%    
Dividend yield 0.00%    
Expected volatility 82.88%    
Maximum [Member] | Employees [Member]      
Schedule Of Net Revenue Attributable To Medicaid Medicare Insurance And Self Pay As Percentage Of Net Air Medical Revenues [Line Items]      
Risk free interest rate 1.20% 1.64% 0.76%
Expected term 4 years 9 months    
Dividend yield 0.00% 0.00% 0.00%
Expected volatility 83.09% 81.36% 97.02%
Maximum [Member] | Non Employees [Member]      
Schedule Of Net Revenue Attributable To Medicaid Medicare Insurance And Self Pay As Percentage Of Net Air Medical Revenues [Line Items]      
Risk free interest rate 1.54%    
Dividend yield 0.00%    
Expected volatility 83.09%    
Warrant [Member]      
Schedule Of Net Revenue Attributable To Medicaid Medicare Insurance And Self Pay As Percentage Of Net Air Medical Revenues [Line Items]      
Stock Price   $ 5.60  
Exercise Price   $ 12.16  
Risk free interest rate   0.03%  
Expected term 0 months 3 months  
Dividend yield 0.00% 0.00%  
Expected volatility   22.76%