Quarterly report pursuant to Section 13 or 15(d)

Equity Method Investment (Details)

v3.19.2
Equity Method Investment (Details)
$ in Thousands
6 Months Ended
Dec. 21, 2018
USD ($)
Apr. 06, 2018
helicopter
Jun. 30, 2019
USD ($)
helicopter
Jun. 30, 2018
USD ($)
Schedule of Equity Method Investments [Line Items]        
Cash paid to acquire a business     $ 0 $ 13,356
Contributions to equity investee     $ 680 $ 0
Cobra Aviation Services LLC        
Schedule of Equity Method Investments [Line Items]        
Number of helicopters | helicopter   3    
Brim Acquisitions LLC        
Schedule of Equity Method Investments [Line Items]        
Number of helicopters | helicopter     1  
Number of leases | helicopter     5  
Brim Equipment Assets | Cobra Aviation Services LLC        
Schedule of Equity Method Investments [Line Items]        
Cash paid to acquire a business $ 1,400      
Payments to acquire equity method investment, contingent upon completion of contractual obligations 600      
Brim Acquisitions LLC        
Schedule of Equity Method Investments [Line Items]        
Contributions to equity investee $ 2,000      
Difference between carrying amount and underlying equity     $ 1,800  
Loss on equity investee     200  
Contributions to equity investee     $ 700  
Brim Acquisitions LLC | Cobra Aviation Services LLC        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership percentage 49.00%      
Brim Acquisitions LLC | Wexford        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership percentage 51.00%