Stock-Based Compensation - Schedule of Option Activity (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	May 16, 2014
Stock Option Exercises from the Plans [Abstract]
Stock based compensation costs	$ 44,906,000	$ 39,732,000	$ 19,843,000
Stock-based compensation capitalized into construction	5,710,000	195,000	195,000
Share Option Plan
Options
Outstanding at January 1, 2014	3,090,000	2,910,000
Granted	644,000
Exercised	(464,000)
Outstanding at December 31, 2014	3,090,000	2,910,000
Fully vested and expected to vest at December 31, 2014	3,090,000
Exercisable at December 31, 2014	990,000
Weighted Average Exercise Price
Outstanding at January 1, 2014	$ 2.44
Granted	$ 4.00
Exercised	$ 1.66
Outstanding at December 31, 2014	$ 2.88	$ 2.44
Fully vested and expected to vest at December 31, 2014	$ 2.88
Exercisable at December 31, 2014	$ 2.37
Weighted Average Remaining Contractual Term
Outstanding at December 31, 2014	7 years 6 months
Fully vested and expected to vest at December 31, 2014	7 years 6 months
Exercisable at December 31, 2014	6 years 6 months
Aggregate Intrinsic Value
Exercisable at December 31, 2014	505,273
Stock Option Exercises from the Plans [Abstract]
Intrinsic value	1,134	0	0
Cash received	773	0	0
Shares authorized for issuance	518,750,000
Unrecognized compensation cost, weighted average period	3 years 4 months 24 days
Unrecognized compensation, stock options	1,300,000
Wynn Resorts Limited 2014 Omnibus Incentive Plan
Options
Outstanding at January 1, 2014	1,380,976	1,606,309
Granted	25,800
Exercised	(211,133)
Forfeited or expired	(40,000)
Outstanding at December 31, 2014	1,380,976	1,606,309
Fully vested and expected to vest at December 31, 2014	1,260,693
Exercisable at December 31, 2014	355,610
Weighted Average Exercise Price
Outstanding at January 1, 2014	$ 75.89
Granted	$ 201.22
Exercised	$ 52.51
Forfeited or expired	$ 140.36
Outstanding at December 31, 2014	$ 79.93	$ 75.89
Fully vested and expected to vest at December 31, 2014	$ 78.98
Exercisable at December 31, 2014	$ 65.10
Weighted Average Remaining Contractual Term
Outstanding at December 31, 2014	4 years 4 months 2 days
Fully vested and expected to vest at December 31, 2014	4 years 4 months 21 days
Exercisable at December 31, 2014	4 years 9 months 11 days
Aggregate Intrinsic Value
Outstanding at December 31, 2014	96,400,313
Fully vested and expected to vest at December 31, 2014	89,241,158
Exercisable at December 31, 2014	29,751,409
Stock Option Exercises from the Plans [Abstract]
Weighted average grant date fair value	$ 29.29	$ 39.93	$ 33.03
Intrinsic value	30,485,000	33,830,000	22,416,000
Cash received	11,086,000	20,436,000	15,583,000
Tax benefits realized	8,506,000	6,362,000	4,903,000
Shares authorized for issuance				4,409,390
Unrecognized compensation cost, weighted average period	3 years 1 month 6 days
Unrecognized compensation, stock options	$ 24,400,000
Expiration period	10 years
Aggregate amount of common stock available for grant	4,407,390