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Benefit Plans - Defined Contribution Plan (Detail) - United States - USD ($)
$ in Millions
12 Months Ended
Jul. 01, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Contribution Plan Disclosure        
Company's matching contribution percentage   50.00%    
Matching contribution expenses   $ 6.9 $ 6.4 $ 6.1
Maximum        
Defined Contribution Plan Disclosure        
Employer matching contributions, percentage of eligible compensation   6.00%    
Wynn Macau        
Defined Contribution Plan Disclosure        
Matching contribution expenses   $ 17.8 $ 16.6 $ 15.8
Wynn Macau | Wynn Macau Plan        
Defined Contribution Plan Disclosure        
Employee contribution percentage   5.00%    
Wynn Macau | CPF System        
Defined Contribution Plan Disclosure        
Employer matching contributions, percentage of eligible compensation 5.00%      
Minimum employee contribution percentage 5.00%      
Annual vesting percentage 10.00%      
Vesting period 10 years