v3.20.4
STOCKHOLDERS' EQUITY - Related Party Transactions (Details)
12 Months Ended
Sep. 14, 2018
USD ($)
item
Dec. 31, 2020
USD ($)
item
$ / shares
shares
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Feb. 01, 2021
Jul. 14, 2018
USD ($)
Related Party Transactions            
Value of stock repurchased and canceled       $ 412,600,000    
Ownership percentage   49.00%        
2.95% Senior Secured Convertible Notes due 2024            
Related Party Transactions            
Principal balance $ 600,000,000.0 $ 600,000,000.0        
Price per share (in dollars per share) | $ / shares   $ 2.12        
Number of shares upon conversion | item   44,422,860        
Maximum            
Related Party Transactions            
Ownership percentage   50.00%        
Class A common stock | 2.95% Senior Secured Convertible Notes due 2024            
Related Party Transactions            
Principal balance           $ 1,000
Number of shares upon conversion   44,422,860        
Class B common stock | Maximum | 2.95% Senior Secured Convertible Notes due 2024            
Related Party Transactions            
Number of shares upon conversion | item 5,666,000          
Wanda            
Related Party Transactions            
Receivable due from related party   $ 700,000 $ 800,000      
Reimbursements   $ 300,000 $ 400,000 $ 0.0    
Wanda | ROFR agreement | Minimum            
Related Party Transactions            
Combined voting power held in Holdings (as a percent) 50.10%          
Silver Lake | 2.95% Senior Secured Convertible Notes due 2024            
Related Party Transactions            
Principal balance $ 600,000,000.0          
Silver Lake | Wanda | ROFR agreement            
Related Party Transactions            
Period following ROFR execution during which certain shares may be purchased 2 years          
Wanda            
Related Party Transactions            
Combined voting power held in Holdings (as a percent)   47.37%        
Ownership percentage   23.08%     9.80%  
Wanda | Class A common stock            
Related Party Transactions            
Voting ratio between Class B and Class A common stock   three-to-one voting ratio        
Wanda | Class B common stock            
Related Party Transactions            
Shares owned | shares   51,769,784        
Number of shares upon conversion   5,666,000