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, 2019	Dec. 31, 2018	Dec. 31, 2017
Numerator:
Net Income (Loss) Attributable to Parent	$ 122,985	$ 572,430	$ 747,181
Denominator:
Weighted average common shares outstanding (used in calculation of basic earnings per share)	106,745	106,529	102,071
Potential dilution from the assumed exercise of stock options and nonvested stock	240	503	527
Weighted average common and common equivalent shares outstanding (used in calculation of diluted earnings per share)	106,985	107,032	102,598
Net income (loss) attributable to Wynn Resorts, Limited per common share, basic (in usd per share)	$ 1.15	$ 5.37	$ 7.32
Net income attributable to Wynn Resorts, Ltd. per common share, diluted (in usd per share)	$ 1.15	$ 5.35	$ 7.28
Antidilutive securities excluded from computation of earnings per share (shares)	277	102	106