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Significant accounting policies (Details)
$ / shares in Units, $ in Thousands
2 Months Ended 3 Months Ended
Mar. 01, 2019
USD ($)
$ / shares
shares
Feb. 04, 2019
USD ($)
$ / shares
shares
Mar. 31, 2019
shares
Mar. 31, 2020
USD ($)
Obligation
shares
Mar. 31, 2019
USD ($)
Dec. 31, 2019
shares
Basis of presentation and principles of consolidation [Abstract]            
Net proceeds from initial public offering | $       $ 0 $ 274,948  
Percentage of voting and non-economic interest   88.00%        
Percentage of economic interest in NFI   88.00%   85.60%    
Percentage of voting interest in NFE       85.60%    
Underwriting discounts and commissions | $       $ 0 $ 6,105  
Revenue recognition [Abstract]            
Number of performance obligations | Obligation       1    
Class A [Member]            
Basis of presentation and principles of consolidation [Abstract]            
Shares outstanding (in shares)       24,236,495   23,607,096
Class A [Member] | IPO [Member]            
Basis of presentation and principles of consolidation [Abstract]            
Shares issued in initial public offering (in shares) 837,272 20,000,000        
IPO price per share (in dollars per share) | $ / shares $ 14.00 $ 14.00        
Net proceeds from initial public offering | $ $ 11,000 $ 257,000        
Shares outstanding (in shares) 20,837,272          
Underwriting discounts and commissions | $ $ 700          
Class A [Member] | Common Stock [Member]            
Basis of presentation and principles of consolidation [Abstract]            
Shares issued in initial public offering (in shares)     20,837,272      
Shares outstanding (in shares)       24,236,495    
Class B [Member]            
Basis of presentation and principles of consolidation [Abstract]            
Shares outstanding (in shares)       144,342,572   144,342,572
Class B [Member] | IPO [Member]            
Basis of presentation and principles of consolidation [Abstract]            
Effects of reorganization transactions (in shares)   147,058,824        
Shares outstanding (in shares)   147,058,824        
Class B [Member] | Common Stock [Member]            
Basis of presentation and principles of consolidation [Abstract]            
Shares outstanding (in shares)       144,342,572