Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended		6 Months Ended
	Feb. 25, 2016	Feb. 28, 2017	Jun. 30, 2018	Mar. 31, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash for Development Projects			$ 22,414		$ 22,414	$ 51,721	$ 41,982	$ 26,384
Restricted cash and investments for Development Projects			29,458		29,458		136,431
Restricted Cash and Investments							136,400
Customer Loyalty Program Liability, Current			1,600		1,600		300
Accrued rent			7,500		7,500		8,300
Gaming Facility License Term						10 years
Restricted cash and investments for Development Projects			22,400		22,400		41,900
Allowance for doubtful accounts			130		130		$ 171
Interest charges capitalized			$ 300	$ 5,900	$ 11,300	$ 9,400
Common stock, shares issued (shares)			32,735,000		32,735,000		32,560,000
Total unrecognized compensation			$ 3,000		$ 3,000
Vesting period for unrecognized compensation cost to be recognized (in years)					3 years
Accumulated other comprehensive loss			128		$ 128		$ 315
Short-term Investments			7,000		7,000		94,500
Retained Earnings (Accumulated Deficit)			359,357		359,357		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			29,500		29,500
Payments of Debt Restructuring Costs		$ 675
Other Assets, Fair Value Disclosure			282		282		251
Commercial Paper [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Short-term Investments			3,500		3,500		59,400
US Treasury Notes Securities [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Short-term Investments			3,500		3,500		$ 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