Quarterly report pursuant to Section 13 or 15(d)

RELATED PARTY TRANSACTIONS (Details)

v3.10.0.1
RELATED PARTY TRANSACTIONS (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
SEACOR          
Related Party Transaction [Line Items]          
Payable due to Seacor (less than)         $ 0.1
Dart          
Related Party Transaction [Line Items]          
Amount of purchased products $ 0.6 $ 0.2 $ 1.3 $ 0.3  
Note receivable 2.6   2.6   $ 2.8
Training Services | Era Training Center, LLC          
Related Party Transaction [Line Items]          
Note receivable 3.7   3.7    
Payments for services 0.1 0.1      
Era Training Center | Training Services | Era Training Center, LLC          
Related Party Transaction [Line Items]          
Expenses from transactions with related party     0.1 0.4  
Era Training Center | Helicopter, Management and Other Services | Era Training Center, LLC          
Related Party Transaction [Line Items]          
Expenses from transactions with related party 0.1 0.1 0.1 $ 0.1  
General and Administrative Expense | SEACOR          
Related Party Transaction [Line Items]          
Expenses from transactions with related party $ 0.1 $ 0.1 $ 0.2