Description of Business (Details)	12 Months Ended
	Dec. 31, 2019 item
Description of Business
Number of parks owned or operated	26
Period of operation of theme parks by the former SFEC under Six Flags name (in years)	40 years
Number of parks branded as "Six Flags" parks	22
United States
Description of Business
Number of parks owned or operated	23
Mexico
Description of Business
Number of parks owned or operated	2
Canada
Description of Business
Number of parks owned or operated	1