Stock-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended		2 Months Ended	12 Months Ended
	May 30, 2019	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2016	May 16, 2014
Share-based Compensation Arrangement by Share-based Payment Award
Unrecognized compensation, stock options					$ 2,700
Unrecognized compensation cost, weighted average period					3 years 6 months 25 days
Stock-based compensation expense					$ 40,372	$ 35,040	$ 43,971
Stock based compensation costs					40,722	35,051	44,051
Tax benefit from compensation expense					5,800	5,700	10,800
Tax benefits (loss) realized from option exercises					$ 8,400	$ 4,600	$ 25,400
WRL 2002 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Shares authorized for issuance					12,750,000
Share Award Plan
Share-based Compensation Arrangement by Share-based Payment Award
Shares authorized for issuance								50,000,000
Aggregate amount of common stock available for grant					31,029,177
Unvested awards compensation not yet recognized					$ 13,300
Unvested awards compensation costs period of recognition					2 years 4 months 17 days
Vested shares issued (in shares)					3,742,418
Weighted-average grant date fair value (in dollars per share)					$ 2.43	$ 3.07	$ 2.22
Wynn Resorts Limited 2014 Omnibus Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award
Shares authorized for issuance									4,409,390
Expiration period					10 years
Aggregate amount of common stock available for grant					2,640,796
Unvested awards compensation not yet recognized					$ 58,100
Unvested awards compensation costs period of recognition					2 years 1 month 28 days
Vested shares issued (in shares)					413,697
Weighted-average grant date fair value (in dollars per share)					$ 119.61	$ 170.13	$ 109.28
Stock options granted (in shares)					0	0	0
Original Share Option Plan
Share-based Compensation Arrangement by Share-based Payment Award
Expected dividend yield					5.70%	5.70%	5.70%
Expected volatility					40.70%	40.20%	41.50%
Risk-free interest rate					1.40%	2.30%	1.10%
Expected term (years)					6 years 6 months	6 years 6 months	6 years 6 months
WML Share Option Plan
Share-based Compensation Arrangement by Share-based Payment Award
Shares authorized for issuance	519,695,860
Term of plan	10 years
Award Incentive Bonus
Share-based Compensation Arrangement by Share-based Payment Award
Stock based compensation costs					$ 6,700	$ 6,700	$ 23,700
Vested shares issued (in shares)			58,783	141,216
Weighted-average grant date fair value (in dollars per share)			$ 113.55	$ 167.82
Award Incentive Bonus | Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award
Vested shares issued (in shares)		44,788
Weighted-average grant date fair value (in dollars per share)		$ 150.03