Summary of Significant Accounting Policies - Schedule of Shares used in Calculation of Earnings Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share [Abstract]
Net Income attributable to Wynn Resorts, Ltd.	$ 109,346	$ 191,406	$ 203,906	$ 226,896	$ 213,884	$ 182,020	$ 129,785	$ 202,963	$ 731,554	$ 728,652	$ 502,036
Weighted average common shares outstanding (used in calculation of basic earnings per share)									100,927	100,540	103,092
Weighted average common and common equivalent shares outstanding (used in calculation of diluted earnings per share)									101,931	101,641	104,249
Potential dilution from the assumed exercise of stock options and nonvested stock									1,004	1,101	1,157
Basic (in usd per share)	$ 1.08	$ 1.90	$ 2.02	$ 2.25	$ 2.12	$ 1.81	$ 1.29	$ 2.02	$ 7.25	$ 7.25	$ 4.87
Diluted (in usd per share)	$ 1.07	$ 1.88	$ 2.00	$ 2.22	$ 2.10	$ 1.79	$ 1.28	$ 2.00	$ 7.18	$ 7.17	$ 4.82
Anti-dilutive stock options excluded from the calculation of diluted earnings per share									26	92	680