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Related Party Transactions - Additional Information (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Oct. 22, 2018
shares
Sep. 11, 2018
$ / shares
shares
Aug. 30, 2018
USD ($)
Nov. 03, 2017
USD ($)
$ / shares
shares
Sep. 30, 2018
USD ($)
shares
Sep. 30, 2019
USD ($)
$ / shares
shares
Sep. 30, 2018
USD ($)
shares
Dec. 31, 2018
USD ($)
Related Party Transaction [Line Items]                
Sale of common stock, value         $ 400,000,000   $ 400,000,000  
Share price (in dollars per share) | $ / shares   $ 10.00            
Number of warrants sold | shares   6,666,666            
Warrants sold, price per warrant | $ / shares   $ 1.50            
Proceeds from sale of Private Placement Warrants to Sponsor             $ 10,000,000  
Class A Common Stock                
Related Party Transaction [Line Items]                
Sale of common stock | shares         40,000,000   40,000,000  
Sale of common stock, value         $ 4,000   $ 4,000  
Share price (in dollars per share) | $ / shares   $ 10.00            
Number of shares warrant may be converted | shares           1    
Warrants exercise price (in dollars per share) | $ / shares           $ 11.50    
Founder Shares                
Related Party Transaction [Line Items]                
Outstanding shares of common stock held by the initial stockholders (as a percent) 20.00%              
Founder Shares | Class A Common Stock                
Related Party Transaction [Line Items]                
Conversion ratio           1    
Founder Shares | Sponsor                
Related Party Transaction [Line Items]                
Number of shares forfeited | shares 781,250              
Founder Shares | Sponsor | Class F Common Stock                
Related Party Transaction [Line Items]                
Sale of common stock | shares       10,781,250        
Sale of common stock, value       $ 25,000        
Share price (in dollars per share) | $ / shares       $ 0.002        
Founder Shares | Director                
Related Party Transaction [Line Items]                
Number of shares transferred | shares       75,000        
Private Placement Warrants | Class A Common Stock                
Related Party Transaction [Line Items]                
Number of shares warrant may be converted | shares           1    
Warrants exercise price (in dollars per share) | $ / shares           $ 11.50    
Private Placement Warrants | Sponsor                
Related Party Transaction [Line Items]                
Number of warrants sold | shares       6,666,666        
Warrants sold, price per warrant | $ / shares       $ 1.50        
Proceeds from sale of Private Placement Warrants to Sponsor       $ 10,000,000        
Sponsor Loan                
Related Party Transaction [Line Items]                
Promissory note to related party       300,000        
Proceeds from Promissory Note to related party     $ 150,000 $ 150,000        
Administrative Service Agreement | Affiliate of the Sponsor                
Related Party Transaction [Line Items]                
Monthly charge for administrative services           $ 20,000    
Transactions during the period             $ 180,000 $ 76,000