Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Summary of Significant Accounting Policies
Percentage of ownership in joint ventures	50.00%
Debt instrument, foreign interest rate	2.00%
Cash equivalents	$ 1,156,285,000	$ 1,349,647,000
Bank deposits and cash on hand	1,025,900,000	1,085,400,000
Restricted cash	977,000	199,936,000
Percentage of credit markers due from customers residing outside of the United States	85.00%	86.00%
Adjustment effect in operating income	8,700,000	14,900,000	30,900,000
Adjustment effect in net income	6,800,000	12,000,000	23,300,000
Adjustment effect in diluted earning per share	$ 0.07	$ 0.12	$ 0.22
Capitalized interest	33,500,000	10,500,000	2,000,000
Interest expense, amortized	12,600,000	11,200,000	11,000,000
Gaming tax expenses	1,800,000,000	2,000,000,000	1,800,000,000
Total advertising costs	23,300,000	21,500,000	23,000,000
Unrecognized tax benefits	88,884,000	89,544,000	84,289,000	85,498,000
Redemption Price Promissory Note With Former Stockholder and Related Party, Due February 18, 2022; Interest At 2%
Summary of Significant Accounting Policies
Debt instrument, principal amount	1,940,000,000
Deferred Tax Liabilities Noncurrent
Summary of Significant Accounting Policies
Unrecognized tax benefits	$ 29,200,000
Other Observable Inputs (Level 2)
Summary of Significant Accounting Policies
Percentage of cash equivalents which are deposits held in foreign currencies	19.00%	91.00%