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VARIABLE INTEREST ENTITIES - Narrative (Details)
£ / shares in Units, £ in Millions
1 Months Ended 9 Months Ended
Apr. 30, 2015
Jul. 31, 2014
Dec. 31, 2018
USD ($)
Affiliates
Class_Of_Shares
Dec. 31, 2013
Apr. 29, 2019
USD ($)
Mar. 14, 2019
USD ($)
Dec. 31, 2018
GBP (£)
Class_Of_Shares
Mar. 31, 2018
USD ($)
May 31, 2004
USD ($)
shares
May 31, 2004
£ / shares
Apr. 30, 2004
Variable Interest Entity [Line Items]                      
Number of variable interest entities | Affiliates     4                
Deferred interest accrued     $ 18,317,000         $ 16,345,000      
Caledonia Investments Plc                      
Variable Interest Entity [Line Items]                      
Ownership percentage by third party     46.00%                
European Union                      
Variable Interest Entity [Line Items]                      
Ownership percentage by third party     5.00%                
Nigerian Company owned by 100% Nigerian Employees                      
Variable Interest Entity [Line Items]                      
Ownership percentage by third party     50.00%                
Purchased percentage from third party 2.00% 29.00%   19.00%              
Employee Trust Fund                      
Variable Interest Entity [Line Items]                      
Ownership percentage by third party     2.00%                
Bristow Aviation Holdings Limited                      
Variable Interest Entity [Line Items]                      
Ownership percentage in Variable Interest Entity     49.00%                
Number of class of shares | Class_Of_Shares     3       3        
Ownership percentage by third party     51.00%                
Purchase of deferred stock shares | shares                 8,000,000    
Business acquisition share price | £ / shares                   £ 1  
Total amount paid for deferred shares                 $ 14,400,000    
Principal amount of subordinated unsecured loan stock     $ 115,900,000       £ 91.0        
Interest rate on unsecured loan     13.50%                
Deferred interest accrued     $ 2,330,164,000         $ 2,130,433,000      
Call Option, Time To Cure, Period     180 days                
Call option price held by noncontrolling interest | £             £ 1.0        
Call Option Guaranteed Rate                 12.00%    
Put Option Guaranteed Rate                     10.00%
Bristow Aviation Holdings Limited | High                      
Variable Interest Entity [Line Items]                      
Call Option Rate Over LIBOR     6.00%       6.00%        
Bristow Aviation Holdings Limited | Low                      
Variable Interest Entity [Line Items]                      
Call Option Rate Over LIBOR     3.00%       3.00%        
Bristow Aviation Holdings Limited | E.U. Investor | Subsequent Event [Member]                      
Variable Interest Entity [Line Items]                      
Call Option, Exercised, Purchase Price           $ 100,000          
Bristow Aviation Holdings Limited | Caledonia Investments Plc | Subsequent Event [Member]                      
Variable Interest Entity [Line Items]                      
Call Option, Exercised, Purchase Price         $ 920,000            
Bristow Helicopters Nigeria Ltd                      
Variable Interest Entity [Line Items]                      
Ownership percentage in Variable Interest Entity     48.00%                
Purchased percentage from third party 8.00%                    
Pan African Airlines Nigeria Ltd                      
Variable Interest Entity [Line Items]                      
Ownership percentage in Variable Interest Entity     50.17%