Segment Information - Summary of Results of Operations by Segment (Detail)		12 Months Ended
	Mar. 30, 2018 USD ($)	Dec. 31, 2018 USD ($) segment	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Segment Reporting Information
Number of Reportable Segments | segment		1
Operating revenues		$ 6,717,660,000	$ 6,070,160,000	$ 4,345,797,000
Adjusted Property EBITDA		2,044,413,000	1,810,732,000	1,259,327,000
Litigation settlement	$ 463,600,000	463,557,000	0	0
Other operating expenses
Pre-opening		53,490,000	26,692,000	154,717,000
Depreciation and amortization		550,596,000	552,368,000	404,730,000
Property charges and other		60,256,000	29,576,000	54,822,000
Corporate expenses and other		144,479,000	102,560,000	80,178,000
Stock-based compensation (2)		36,491,000	43,971,000	43,218,000
Total other operating expenses		1,308,869,000	755,167,000	737,665,000
Operating income		735,544,000	1,055,565,000	521,662,000
Other non-operating income and expenses
Interest income		29,866,000	31,193,000	13,536,000
Interest expense, net of amounts capitalized		(381,849,000)	(388,664,000)	(289,365,000)
Change in derivatives fair value		(4,520,000)	(1,056,000)	433,000
Change in Redemption Note fair value		(69,331,000)	(59,700,000)	65,043,000
Gain (loss) on extinguishment of debt		104,000	(55,360,000)	0
Other		(4,074,000)	(21,709,000)	(712,000)
Other income (expense), net		(429,804,000)	(495,296,000)	(211,065,000)
Income before income taxes		305,740,000	560,269,000	310,597,000
Benefit (provision) for income taxes		497,344,000	328,985,000	(8,128,000)
Net income		803,084,000	889,254,000	302,469,000
Net income attributable to noncontrolling interest		230,654,000	142,073,000	60,494,000
Net income attributable to Wynn Resorts, Limited		572,430,000	747,181,000	241,975,000
Excluded amounts		35,040,000	43,971,000	43,722,000
Pre-Opening Expenses
Other non-operating income and expenses
Excluded amounts		750,000	0	504,000
Property Charges and Other
Other non-operating income and expenses
Excluded amounts		(2,201,000)	0	0
Macau Operations
Segment Reporting Information
Operating revenues		5,052,091,000	4,367,197,000	2,706,295,000
Adjusted Property EBITDA		1,577,140,000	1,288,335,000	784,545,000
Las Vegas Operations
Segment Reporting Information
Operating revenues		1,665,569,000	1,702,963,000	1,639,502,000
Adjusted Property EBITDA		467,273,000	522,397,000	474,782,000
Wynn Palace | Macau Operations
Segment Reporting Information
Operating revenues		2,757,566,000	2,030,287,000	555,574,000
Adjusted Property EBITDA		843,902,000	527,583,000	103,036,000
Wynn Macau | Macau Operations
Segment Reporting Information
Operating revenues		2,294,525,000	2,336,910,000	2,150,721,000
Adjusted Property EBITDA		$ 733,238,000	$ 760,752,000	$ 681,509,000