Income Taxes - Additional Information (Detail) $ / shares in Units, MOP$ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) $ / shares	Dec. 31, 2018 USD ($) $ / shares	Dec. 31, 2017 USD ($) $ / shares	Dec. 31, 2019 MOP (MOP$)	Dec. 31, 2019 USD ($)
Income Taxes
Tax exemption period	5 years
Complementary tax rate	12.00%
Amount of complementary tax exemption	$ 77,700,000	$ 96,800,000	$ 63,000,000.0
Amount of complementary tax exemption per share | $ / shares	$ 0.73	$ 0.90	$ 0.61
Annual complementary tax to be paid		$ 1,600,000	$ 1,600,000	MOP$ 12.8	$ 1,600,000
Provisional net tax benefit	$ 390,900,000	339,900,000	339,900,000
Recognized foreign tax credit tax benefit net of valuation allowance	32,900,000	82,800,000	746,600,000
Increase (decrease) in valuation allowance for deferred tax assets	(115,500,000)	746,600,000
Tax benefits (loss) realized	5,700,000	2,000,000.0	2,600,000
FTC carryforwards expired					87,100,000
Foreign tax credit carryforwards					3,100,000,000
Disallowed interest carryforwards not subject to expiration					385,700,000
U.S. and foreign uncertain tax positions that increase NOL and foreign tax credit carryforward deferred tax assets		99,500,000	95,200,000		104,300,000
Uncertain tax positions, noncurrent		0			0
Unrecognized tax benefits that would impact the effective tax rate if recognized		31,000,000.0	26,900,000		36,600,000
Recognized interest and penalties	0	0	900,000
Decrease in unrecognized tax benefits due to expiration of the statute of limitations	4,161,000	4,692,000	3,807,000
Maximum
Income Taxes
Unrecognized tax benefit increase resulting in tax settlements					5,400,000
Tax Credit Carryforward Expiry In 2020
Income Taxes
Foreign tax credit carryforwards					530,400,000
Tax Credit Carryforward Expiry In 2021
Income Taxes
Foreign tax credit carryforwards					540,300,000
Tax Credit Carryforward Expiry In 2023
Income Taxes
Foreign tax credit carryforwards					756,000,000.0
Tax Credit Carryforward Expiry In 2024
Income Taxes
Foreign tax credit carryforwards					710,700,000
Tax Credit Carryforward, Expires at 2025
Income Taxes
Foreign tax credit carryforwards					47,200,000
Tax Credit Carryforward, Expires at 2027
Income Taxes
Foreign tax credit carryforwards					486,300,000
Foreign Tax Credit
Income Taxes
Valuation allowance		2,490,000,000			2,510,000,000
Interest Expense Carryforwards
Income Taxes
Valuation allowance					88,300,000
Other Deferred Tax Asset
Income Taxes
Valuation allowance		5,300,000			6,400,000
Wynn Macau
Income Taxes
Decrease in unrecognized tax benefits due to expiration of the statute of limitations	$ 4,200,000	4,700,000	3,800,000
U.S.
Income Taxes
Tax credit of "net" foreign source income	21.00%
Foreign tax credit carryforwards		3,187,797,000			3,070,914,000
Tax loss carryforward					0
Valuation allowance		2,500,027,000			2,604,497,000
Foreign
Income Taxes
Gaming tax	35.00%
Tax loss carryforward		340,000,000.0	$ 319,100,000		376,800,000
Valuation allowance		$ 143,872,000			$ 154,934,000