Quarterly report pursuant to Section 13 or 15(d)

Related Party Transactions - Narrative (Details)

v3.20.2
Related Party Transactions - Narrative (Details)
$ in Thousands
9 Months Ended 12 Months Ended
Dec. 21, 2018
USD ($)
helicopter
Apr. 06, 2018
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2019
Related Party Transaction [Line Items]          
Contributions to equity investee     $ 0 $ (680)  
Percentage of ownership     100.00%   100.00%
Cobra Aviation Services LLC          
Related Party Transaction [Line Items]          
Number of assets purchased | helicopter 2        
Brim Acquisitions LLC          
Related Party Transaction [Line Items]          
Initial capital of acquisition $ 2,000        
Contributions to equity investee       $ (700)  
Brim Acquisitions LLC | Cobra Aviation Services LLC          
Related Party Transaction [Line Items]          
Equity method investment, ownership percentage 49.00%        
Brim Acquisitions LLC | Wexford          
Related Party Transaction [Line Items]          
Equity method investment, ownership percentage 51.00%        
Wexford          
Related Party Transaction [Line Items]          
Percentage of ownership   49.00% 48.20%   48.90%