Quarterly report pursuant to Section 13 or 15(d)

Equity Method Investment - Narrative (Details)

v3.21.2
Equity Method Investment - Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended
Dec. 21, 2018
USD ($)
helicopter
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
helicopter
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Cobra Aviation Services LLC            
Schedule of Equity Method Investments [Line Items]            
Number of helicopters | helicopter       2    
Brim Acquisitions LLC            
Schedule of Equity Method Investments [Line Items]            
Number of helicopters | helicopter 4          
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 $ 2.0          
Brim Acquisitions LLC            
Schedule of Equity Method Investments [Line Items]            
Contributions to equity investee $ 2.0          
Difference between carrying amount and underlying equity   $ 3.2   $ 3.2   $ 3.7
Adjustment to income (loss) on equity investee   $ (0.5) $ 0.5 $ (0.5) $ (0.6)  
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%