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Stockholder's Equity - Additional Information (Detail)														1 Months Ended	3 Months Ended												12 Months Ended
	Feb. 06, 2020 $ / shares	Sep. 16, 2019 $ / shares	Sep. 16, 2019 USD ($)	Jun. 19, 2019 $ / shares	Jun. 19, 2019 USD ($)	Oct. 05, 2018 $ / shares	Oct. 05, 2018 USD ($)	Apr. 25, 2018 $ / shares	Apr. 25, 2018 USD ($)	Sep. 15, 2017 $ / shares	Sep. 15, 2017 USD ($)	Jun. 20, 2017 $ / shares	Jun. 20, 2017 USD ($)	Feb. 18, 2012 shares	Dec. 31, 2019 USD ($) $ / shares	Sep. 30, 2019 $ / shares	Jun. 30, 2019 $ / shares	Mar. 31, 2019 $ / shares	Dec. 31, 2018 $ / shares	Sep. 30, 2018 $ / shares	Jun. 30, 2018 $ / shares	Mar. 31, 2018 $ / shares	Dec. 31, 2017 $ / shares	Sep. 30, 2017 $ / shares	Jun. 30, 2017 $ / shares	Mar. 31, 2017 $ / shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares
Equity, Class of Treasury Stock
Stock repurchases, shares | shares																											176,989	19,120	148,413
Net cost for common stock purchased																											$ 66,986,000	$ 159,544,000	$ 17,771,000
Dividend paid (per share) | $ / shares															$ 1.00	$ 1.00	$ 1.00	$ 0.75	$ 0.75	$ 0.75	$ 0.75	$ 0.50	$ 0.50	$ 0.50	$ 0.50	$ 0.50	$ 3.75	$ 2.75	$ 2.00
Cash dividends																											$ 568,787,000	$ 571,451,000	$ 321,083,000
Decrease from distributions to noncontrolling interest																											$ 7,745,000	$ 305,372,000	$ 11,436,000
Common shares redeemed and canceled (in shares) | shares														24,549,222
Wynn Macau, Limited
Equity, Class of Treasury Stock
Company's share of dividend			$ 215,100,000		$ 215,000,000.0		$ 358,300,000		$ 358,800,000		$ 100,600,000		$ 202,000,000.0
Decrease from distributions to noncontrolling interest			82,900,000		82,900,000		138,300,000		138,300,000		38,800,000		77,900,000
Subsidiaries | Wynn Macau, Limited
Equity, Class of Treasury Stock
Dividend paid (per share) | $ / shares		$ 0.45		$ 0.45		$ 0.75		$ 0.75		$ 0.21		$ 0.42
Cash dividends			$ 298,000,000.0		$ 298,000,000.0		$ 496,600,000		$ 497,100,000		$ 139,400,000		$ 279,900,000
Wynn Palace and Wynn Macau
Equity, Class of Treasury Stock
Percentage of ownership															72.00%												72.00%
Equity Repurchase Program
Equity, Class of Treasury Stock
Authorized amount under repurchase program															$ 1,000,000,000.0												$ 1,000,000,000.0
Stock repurchases, shares | shares																											413,439	1,478,552	0
Net cost for common stock purchased																											$ 43,200,000	$ 156,700,000
Repurchase authority remaining under the program															$ 800,100,000												800,100,000
Total Wynn Resorts,  Limited stockholders' equity
Equity, Class of Treasury Stock
Net cost for common stock purchased																											66,986,000	159,544,000	$ 17,771,000
Cash dividends																											402,952,000	294,923,000	204,515,000
Noncontrolling Interests
Equity, Class of Treasury Stock
Cash dividends																											165,835,000	276,528,000	116,568,000
Decrease from distributions to noncontrolling interest																											$ 7,745,000	$ 305,400,000	$ 11,436,000
Subsequent Event
Equity, Class of Treasury Stock
Dividends declared per common share (usd per share) | $ / shares	$ 1.00

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