Earnings Per Share - Schedule of Shares used in Calculation of Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Numerator:
Net income (loss) attributable to Wynn Resorts, Limited	$ (402,037)	$ 104,872
Denominator:
Weighted average common shares outstanding (shares)	106,663	106,792
Potential dilutive effect of stock options and restricted stock (shares)	0	281
Weighted average common and common equivalent shares outstanding (shares)	106,663	107,073
Net income (loss) attributable to Wynn Resorts, Limited per common share, basic (in usd per share)	$ (3.77)	$ 0.98
Net income attributable to Wynn Resorts, Ltd. per common share, diluted (in usd per share)	$ (3.77)	$ 0.98
Antidilutive securities excluded from computation of earnings per share (shares)	1,209	355