Quarterly report pursuant to Section 13 or 15(d)

COMMITMENTS AND CONTINGENCIES (Details)

v3.8.0.1
COMMITMENTS AND CONTINGENCIES (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
helicopter
Sep. 30, 2017
USD ($)
helicopter
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Loss Contingencies [Line Items]        
Unfunded capital commitments $ 118,600 $ 118,600    
Unfunded capital commitments payable 7,400 7,400    
Non-cancellable portion due next twelve months 2,800 2,800    
Deposits paid 1,300 1,300    
Commitments eligible for termination 114,300 114,300    
Liquidated damages 2,600 2,600    
Other current assets 0 0   $ 3,777
Utilized credits     $ 1,700  
Contingent Fees Sought by Former Tax Consultant | Pending Litigation        
Loss Contingencies [Line Items]        
Taxes, penalties and interest   500    
Employment-Related Litigation Matters | Pending Litigation        
Loss Contingencies [Line Items]        
Taxes, penalties and interest   100    
Unfavorable Regulatory Action | Brazilian Customs Authorities Claims | Pending Litigation        
Loss Contingencies [Line Items]        
Taxes, penalties and interest   1,000    
Foreign Tax Authority | Aeroleo | Brazilian Tax Dispute with Respect to Certain Tax Credits        
Loss Contingencies [Line Items]        
Taxes, penalties and interest   2,500    
Foreign Tax Authority | Municipal Tax Authorities of Rio de Janeiro and Macae | Aeroleo        
Loss Contingencies [Line Items]        
Taxes, penalties and interest   7,400    
Foreign Tax Authority | Foreign Tax Authority | Aeroleo | Brazilian Tax Dispute with Respect to Employer Social Security Contributions        
Loss Contingencies [Line Items]        
Taxes, penalties and interest   3,000    
Foreign Tax Authority | Foreign Tax Authority | Aeroleo | Other Litigation Matters        
Loss Contingencies [Line Items]        
Other current assets 10,200 10,200    
Foreign Tax Authority | State of Rio de Janeiro | Aeroleo        
Loss Contingencies [Line Items]        
Taxes, penalties and interest $ 400      
Installment payments   200    
Damages dismissed   1,600    
Brazil Taxing Authorities | Tax Disputes over Tax Credits Applied to Offset Social Tax Liability | Pending Litigation        
Loss Contingencies [Line Items]        
Taxes, penalties and interest   $ 300    
AW189 Heavy Helicopters        
Loss Contingencies [Line Items]        
Number of helicopters | helicopter 5 5    
Number of additional helicopters | helicopter 10 10    
S92 Heavy Helicopters        
Loss Contingencies [Line Items]        
Number of helicopters | helicopter 1 1    
AW169 Light Twin Helicopters        
Loss Contingencies [Line Items]        
Number of helicopters | helicopter 5 5