Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended		9 Months Ended
	Feb. 25, 2016	Feb. 28, 2017	Sep. 30, 2018	Mar. 31, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash for Development Projects						$ 45,212	$ 41,982	$ 26,384
Restricted cash and investments for Development Projects			$ 64,178		$ 64,178		136,431
Restricted Cash and Investments							136,400
Customer Loyalty Program Liability, Current			2,100		2,100		300
Accrued rent			7,500		7,500		8,300
Gaming Facility License Term						10 years
Restricted cash and investments for Development Projects							42,000
Allowance for doubtful accounts			154		154		$ 171
Interest charges capitalized			$ 300	$ 8,200	$ 11,700	$ 17,600
Common stock, shares issued (shares)			32,717,000		32,717,000		32,560,000
Total unrecognized compensation			$ 2,300		$ 2,300
Vesting period for unrecognized compensation cost to be recognized (in years)					3 years
Accumulated other comprehensive loss			89		$ 89		$ 315
Short-term Investments							94,500
Retained Earnings (Accumulated Deficit)			393,105		393,105		301,032
Montreign [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Gaming Facility License Fee	$ 51,000
Term Loan Facility, Term B Loan [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash for Development Projects			64,200		64,200
Payments of Debt Restructuring Costs		$ 675
Other Assets, Fair Value Disclosure			287		287		251
Commercial Paper [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Short-term Investments							59,400
US Treasury Notes Securities [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Short-term Investments							$ 35,100
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Other Accrued Liabilities			54		54
Retained Earnings (Accumulated Deficit)			$ 54		$ 54
Kien Huat Realty III Limited Investment Agreement [Member] | Kien Huat Realty III Limited [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Common stock, shares issued (shares)			200,000		200,000