Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Sep. 30, 2014 Other Observable Inputs (Level 2)	Dec. 31, 2013 Other Observable Inputs (Level 2)	Feb. 18, 2012 Aruze USA, Inc.	Sep. 30, 2014 Fair Value, Measurements, Recurring	Dec. 31, 2013 Fair Value, Measurements, Recurring	Sep. 30, 2014 Fair Value, Measurements, Recurring Other Observable Inputs (Level 2)	Dec. 31, 2013 Fair Value, Measurements, Recurring Other Observable Inputs (Level 2)
Summary of Significant Accounting Policies [Line Items]
Percentage of ownership in joint ventures	50.00%		50.00%
Cash equivalents									$ 1,741,545,000	$ 1,349,647,000	$ 1,741,093,000	$ 1,128,724,000
Bank deposits and cash on hand									1,149,400,000	1,085,400,000
Restricted Cash and Cash Equivalents	0		0		199,936,000
Percentage of credit markers due from customers residing outside of the United States	85.00%		85.00%		86.00%
Adjustment effect in operating income			8,700,000	14,900,000
Adjustment effect in net income			6,800,000	12,000,000
Adjustment effect in net income per share, diluted			$ 0.07	$ 0.12
Debt instrument, principal amount								1,940,000,000.00
Debt instrument, interest rate								2.00%
Gaming tax expenses	446,300,000	488,500,000	1,462,800,000	1,431,700,000
Percentage of cash equivalents which are deposits held in foreign currencies						12.00%	91.00%
Unrecognized tax benefits	$ 29,300,000		$ 29,300,000