Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended		9 Months Ended						1 Months Ended
	Feb. 18, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Feb. 29, 2012	Sep. 30, 2013 Other Observable Inputs (Level 2)	Dec. 31, 2012 Other Observable Inputs (Level 2)	Feb. 18, 2012 Aruze USA, Inc.	Sep. 30, 2013 Fair Value, Measurements, Recurring	Dec. 31, 2012 Fair Value, Measurements, Recurring	Sep. 30, 2013 Fair Value, Measurements, Recurring Other Observable Inputs (Level 2)	Dec. 31, 2012 Fair Value, Measurements, Recurring Other Observable Inputs (Level 2)	Sep. 30, 2013 Redemption Price Promissory Note With Former Stockholder And Related Party, Due February 18, 2022; Interest At 2%	Dec. 31, 2012 Redemption Price Promissory Note With Former Stockholder And Related Party, Due February 18, 2022; Interest At 2%	Sep. 30, 2013 7 7/8% Wynn Las Vegas First Mortgage Notes, Due November 1, 2017	May 15, 2013 7 7/8% Wynn Las Vegas First Mortgage Notes, Due November 1, 2017	Dec. 31, 2012 7 7/8% Wynn Las Vegas First Mortgage Notes, Due November 1, 2017
Summary of Significant Accounting Policies [Line Items]
Cash equivalents											$ 875,962,000	$ 969,166,000	$ 648,953,000	$ 888,732,000
Bank deposits and cash on hand											1,165,200,000	756,000,000
Restricted cash		443,000,000		443,000,000		99,200,000
Current restricted cash		243,000,000		243,000,000
Debt instrument, interest rate										2.00%					2.00%	2.00%	7.875%	7.875%	7.875%
Long-term debt due date																	2017
Long-term restricted cash		200,000,000		200,000,000		99,200,000
Percentage of credit markers due from customers residing outside of the United States		84.00%		84.00%		84.00%
Adjustment effect in operating income				14,900,000	30,900,000
Adjustment effect in net income				12,000,000	23,300,000
Adjustment effect in diluted earning per share				$ 0.12	$ 0.22
Common shares redeemed and canceled	24,549,222			24,549,222						24,549,222
Debt instrument, principal amount		1,940,000,000		1,940,000,000		1,940,000,000	1,940,000,000			1,940,000,000	(1,936,443,000)	(1,936,443,000)	(1,936,443,000)	(1,936,443,000)	1,940,000,000			500,000,000
Gaming tax expenses		488,500,000	448,600,000	1,431,700,000	1,356,200,000
Total advertising costs		$ 4,100,000	$ 5,500,000	$ 16,500,000	$ 16,800,000
Percentage of cash equivalents which are deposits held in foreign currencies								65.00%	77.00%