Annual report pursuant to Section 13 and 15(d)

SHARE-BASED COMPENSATION Narrative (Details)

v3.8.0.1
SHARE-BASED COMPENSATION Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation $ 4,600,000 $ 4,600,000 $ 3,700,000  
Unrecognized compensation costs $ 2,800,000      
Unrecognized compensation cost period for recognition (in years) 1 year 8 months 12 days      
Granted (in shares) 0      
Aggregate intrinsic value of exercised stock options   $ 0    
Aggregate intrinsic value of all vested/exercisable stock options outstanding $ 200,000      
Era Group Inc. 2012 Incentive Plan | Common Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum number of shares authorized       4,000,000
Shares remaining available for grant 2,525,563 2,747,662    
Era Group Inc. 2013 Employee Stock Purchase Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum number of shares authorized       300,000
Shares remaining available for grant 336,763 461,811    
Percentage of stock price employees can purchase       85.00%
Offering period       6 months
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized   400,000    
Expiration period       10 years
Number of shares issued under ESPP 125,102      
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares) 297,256 342,913 193,668  
Granted (in dollars per share) $ 11.44 $ 10.56 $ 20.82  
Fair value of closing price on grant date $ 5,500,000 $ 3,200,000 $ 1,900,000