Stockholder's Equity - Additional Information (Detail) - USD ($)		1 Months Ended	3 Months Ended											12 Months Ended
	Jan. 30, 2019	Feb. 18, 2012	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Equity, Class of Treasury Stock
Stock repurchases, shares														19,120	148,413	198,942
Net cost for common stock purchased														$ 159,544,000	$ 17,771,000	$ 14,017,000
Dividend paid (per share)			$ 0.75	$ 0.75	$ 0.75	$ 0.50	$ 0.5	$ 0.5	$ 0.5	$ 0.5	$ 0.5	$ 0.5	$ 0.5	$ 2.75
Cash dividends declared														$ 571,451,000	$ 321,083,000	$ 313,926,000
Common shares redeemed and canceled		24,549,222
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														1,478,552	0	0
Net cost for common stock purchased														$ 156,700,000
Repurchase authority remaining under the program			$ 843,300,000											843,300,000
Total Wynn Resorts, Limited stockholders' equity (deficit)
Equity, Class of Treasury Stock
Net cost for common stock purchased														159,544,000	$ 17,771,000	$ 14,017,000
Cash dividends declared														$ 294,923,000	$ 204,515,000	$ 202,210,000
Subsequent Event
Equity, Class of Treasury Stock
Dividends declared per common share (usd per share)	$ 0.75