Severance and Other Separation Costs - Additional Information (Detail) $ in Millions		3 Months Ended	6 Months Ended	12 Months Ended
	Feb. 27, 2018 USD ($)	Sep. 30, 2018 Position	Jun. 30, 2018 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Restructuring Cost And Reserve [Line Items]
Severance related payments	$ 6.7		$ 3.8
2020 Restructuring Program [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring costs, description				In September 2020, the Company committed to a plan of termination (the “2020 Restructuring Program”) primarily impacting some of the Company’s previously furloughed salaried, full-time and part-time employees. Substantially all of the impacted employees were furloughed as part of the Company’s efforts to reduce operating expenses and adjust cash flows in light of business circumstances associated with the COVID-19 pandemic. Due to the sudden and unforeseeable economic impacts of the pandemic on the Company’s business operations, that were not reasonably foreseeable at the time of the temporary furloughs, the Company transitioned certain park and corporate personnel from a furloughed status to a permanent layoff. As a result, during the year ended December 31, 2020, the Company recorded approximately $2.7 million in pre-tax restructuring charges primarily related to severance and other termination benefits related to the 2020 Restructuring Program, which is included in severance and other separation costs in the accompanying consolidated statements of comprehensive (loss) income. Currently, some of the Company’s employees at certain parks remain on furlough.  The Company continues to monitor the impact of the COVID-19 pandemic and may adjust its plans accordingly.
Severance and other separation costs				$ 2.7
2019 Restructuring Program [Member]
Restructuring Cost And Reserve [Line Items]
Severance and other separation costs					$ 4.2
2018 Restructuring Program [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring costs, description				In August 2018, the Company announced a restructuring program (the “2018 Restructuring Program”) focused on reducing costs, improving operating margins and streamlining its management structure to create efficiencies and better align with its strategic business objectives.  The 2018 Restructuring Program involved the elimination of approximately 125 positions during the third quarter of 2018 across the Company’s theme parks and its corporate headquarters. As a result, during the year ended December 31, 2018, the Company recorded approximately $5.5 million in pre-tax restructuring charges primarily related to severance and other termination benefits, which is included in severance and other separation costs in the accompanying consolidated statements of comprehensive (loss) income. The Company will not incur any additional costs associated with the 2018 Restructuring Program as all continuing service obligations were completed as of December 31, 2018.
Number of positions eliminated | Position		125
Restructuring and other related costs incurred to date						$ 5.5