Segment Information - Summary of Results of Operations by Segment (Detail)		12 Months Ended
	Mar. 30, 2018 USD ($)	Dec. 31, 2019 USD ($) segment	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Segment Reporting Information
Total operating revenues		$ 6,611,099,000	$ 6,717,660,000	$ 6,070,160,000
Adjusted Property EBITDA		1,815,408,000	2,044,413,000	1,810,732,000
Other operating expenses
Litigation settlement	$ 463,600,000	0	463,557,000	0
Pre-opening		102,009,000	53,490,000	26,692,000
Depreciation and amortization		624,878,000	550,596,000	552,368,000
Property charges and other		20,286,000	60,256,000	29,576,000
Corporate expenses and other		150,228,000	144,479,000	102,560,000
Stock-based compensation (3)		39,702,000	36,491,000	43,971,000
Total other operating expenses		937,103,000	1,308,869,000	755,167,000
Operating income		878,305,000	735,544,000	1,055,565,000
Other non-operating income and expenses
Interest income		24,449,000	29,866,000	31,193,000
Interest expense, net of amounts capitalized		(414,030,000)	(381,849,000)	(388,664,000)
Change in derivatives fair value		(3,228,000)	(4,520,000)	(1,056,000)
Change in Redemption Note fair value		0	(69,331,000)	(59,700,000)
(Loss) gain on extinguishment of debt		(12,437,000)	104,000	(55,360,000)
Other		15,159,000	(4,074,000)	(21,709,000)
Other income (expense), net		(390,087,000)	(429,804,000)	(495,296,000)
Income before income taxes		488,218,000	305,740,000	560,269,000
(Provision) benefit for income taxes		(176,840,000)	497,344,000	328,985,000
Net income		311,378,000	803,084,000	889,254,000
Net income attributable to noncontrolling interest		188,393,000	230,654,000	142,073,000
Net income attributable to Wynn Resorts, Limited		122,985,000	572,430,000	747,181,000
Pre-opening expenses excluded from stock-based compensation		700,000	700,000	0
Property charges and other expenses excluded from stock-based compensation			(2,200,000)
Casino
Segment Reporting Information
Total operating revenues		4,573,924,000	4,784,990,000	4,244,303,000
Rooms
Segment Reporting Information
Total operating revenues		804,162,000	751,800,000	670,957,000
Food and Beverage
Segment Reporting Information
Total operating revenues		818,822,000	754,128,000	732,115,000
Entertainment, retail and other
Segment Reporting Information
Total operating revenues		$ 414,191,000	426,742,000	422,785,000
Macau Operations
Segment Reporting Information
Number of Reportable Segments | segment		1
Las Vegas Operations
Segment Reporting Information
Number of Reportable Segments | segment		1
Encore Boston Harbor
Segment Reporting Information
Number of Reportable Segments | segment		1
Operating Segments | Macau Operations
Segment Reporting Information
Total operating revenues		$ 4,613,723,000	5,052,091,000	4,367,197,000
Adjusted Property EBITDA		1,378,372,000	1,577,140,000	1,288,335,000
Operating Segments | Las Vegas Operations
Segment Reporting Information
Total operating revenues		1,633,457,000	1,665,569,000	1,702,963,000
Adjusted Property EBITDA		413,886,000	467,273,000	522,397,000
Operating Segments | Las Vegas Operations | Casino
Segment Reporting Information
Total operating revenues		394,104,000	434,083,000	456,093,000
Operating Segments | Las Vegas Operations | Rooms
Segment Reporting Information
Total operating revenues		483,055,000	468,238,000	453,376,000
Operating Segments | Las Vegas Operations | Food and Beverage
Segment Reporting Information
Total operating revenues		558,782,000	567,121,000	567,926,000
Operating Segments | Las Vegas Operations | Entertainment, retail and other
Segment Reporting Information
Total operating revenues		197,516,000	196,127,000	225,568,000
Operating Segments | Encore Boston Harbor
Segment Reporting Information
Total operating revenues		363,919,000	0	0
Adjusted Property EBITDA		23,150,000	0	0
Operating Segments | Encore Boston Harbor | Casino
Segment Reporting Information
Total operating revenues		243,855,000	0	0
Operating Segments | Encore Boston Harbor | Rooms
Segment Reporting Information
Total operating revenues		36,144,000	0	0
Operating Segments | Encore Boston Harbor | Food and Beverage
Segment Reporting Information
Total operating revenues		61,088,000	0	0
Operating Segments | Encore Boston Harbor | Entertainment, retail and other
Segment Reporting Information
Total operating revenues		22,832,000	0	0
Operating Segments | Wynn Palace | Macau Operations
Segment Reporting Information
Total operating revenues		2,543,694,000	2,757,566,000	2,030,287,000
Adjusted Property EBITDA		729,535,000	843,902,000	527,583,000
Operating Segments | Wynn Palace | Macau Operations | Casino
Segment Reporting Information
Total operating revenues		2,139,756,000	2,356,022,000	1,714,417,000
Operating Segments | Wynn Palace | Macau Operations | Rooms
Segment Reporting Information
Total operating revenues		174,576,000	170,067,000	121,710,000
Operating Segments | Wynn Palace | Macau Operations | Food and Beverage
Segment Reporting Information
Total operating revenues		117,376,000	110,638,000	96,078,000
Operating Segments | Wynn Palace | Macau Operations | Entertainment, retail and other
Segment Reporting Information
Total operating revenues		111,986,000	120,839,000	98,082,000
Operating Segments | Wynn Macau | Macau Operations
Segment Reporting Information
Total operating revenues		2,070,029,000	2,294,525,000	2,336,910,000
Adjusted Property EBITDA		648,837,000	733,238,000	760,752,000
Operating Segments | Wynn Macau | Macau Operations | Casino
Segment Reporting Information
Total operating revenues		1,796,209,000	1,994,885,000	2,073,793,000
Operating Segments | Wynn Macau | Macau Operations | Rooms
Segment Reporting Information
Total operating revenues		110,387,000	113,495,000	95,871,000
Operating Segments | Wynn Macau | Macau Operations | Food and Beverage
Segment Reporting Information
Total operating revenues		81,576,000	76,369,000	68,111,000
Operating Segments | Wynn Macau | Macau Operations | Entertainment, retail and other
Segment Reporting Information
Total operating revenues		$ 81,857,000	$ 109,776,000	$ 99,135,000