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Earnings Per Share - Schedule of Shares used in Calculation of Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Numerator:
Net Income (Loss) Attributable to Parent	$ (2,067,245)	$ 122,985	$ 572,430
Denominator:
Weighted average common shares outstanding (used in calculation of basic earnings per share)	106,745	106,745	106,529
Potential dilution from the assumed exercise of stock options and nonvested stock	0	240	503
Weighted average common and common equivalent shares outstanding (used in calculation of diluted earnings per share)	106,745	106,985	107,032
Net income (loss) attributable to Wynn Resorts, Limited per common share, basic (in usd per share)	$ (19.37)	$ 1.15	$ 5.37
Net income attributable to Wynn Resorts, Ltd. per common share, diluted (in usd per share)	$ (19.37)	$ 1.15	$ 5.35
Antidilutive securities excluded from computation of earnings per share (shares)	1,044	277	102

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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