Restructuring Programs and Other Separation Costs - Additional Information (Detail) $ in Millions		1 Months Ended	3 Months Ended	6 Months Ended	9 Months Ended
	Feb. 27, 2018 USD ($)	Oct. 31, 2017 Position	Sep. 30, 2018 USD ($) Position	Jun. 30, 2018 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)
Restructuring Cost And Reserve [Line Items]
Severance costs	$ 6.7
Other Executives [Member]
Restructuring Cost And Reserve [Line Items]
Severance costs				$ 3.8
2018 Restructuring Program [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring costs, description					involved the elimination of approximately 125 positions during the third quarter of 2018 across the Company’s theme parks and its corporate headquarters.
Number of positions eliminated | Position			125
Restructuring and other related costs incurred to date			$ 3.8		$ 5.5
2017 Restructuring Program [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring costs, description					involved the elimination of approximately 350 positions across all of the Company’s theme parks and corporate headquarters.
Number of positions eliminated | Position		350
Restructuring and other related costs incurred to date						$ 5.2