Stock-Based Compensation - Schedule of Nonvested Activity (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award
Tax benefits realized	$ 9,400,000	$ 10,500,000	$ 5,500,000
Share Award Plan
Shares:
Nonvested, beginning of period	0
Granted	8,019,000
Vested	0
Forfeited	(276,000)
Nonvested, end of period	7,743,000
Weighted Average Grant Date Fair Value:
Nonvested, beginning of period	$ 0.00
Granted	$ 3.81
Vested	$ 0.00
Forfeited	$ 3.81
Nonvested, end of period	$ 3.81
Share Option Plan
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 1.66	$ 0.78	$ 0.78
Weighted Average Grant Date Fair Value:
Intrinsic value	1,134	0	0
Cash received	773	0	0
Wynn Resorts Limited 2014 Omnibus Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 178.48	$ 125.56	$ 110.04
Fair value of shares vested	9,430,000	36,328,000	15,653,000
Tax benefits realized	870,000	4,112,000	634,000
Nonvested Awards, Unamortized Compensation Cost Not yet Recognized	22,700,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	3 years
Shares:
Nonvested, beginning of period	397,500
Granted	54,500
Vested	(52,834)
Forfeited	(9,166)
Nonvested, end of period	390,000	397,500
Weighted Average Grant Date Fair Value:
Nonvested, beginning of period	$ 113.13
Granted	$ 209.92
Vested	$ 178.48
Forfeited	$ 104.79
Nonvested, end of period	$ 118.00	$ 113.13
Intrinsic value	30,485,000	33,830,000	22,416,000
Cash received	$ 11,086,000	$ 20,436,000	$ 15,583,000