Restructuring Programs and Other Separation Costs - Additional Information (Detail) $ in Millions		3 Months Ended		6 Months Ended	12 Months Ended
	Feb. 27, 2018 USD ($)	Sep. 30, 2018 Position	Dec. 31, 2017 USD ($) Position	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2016 USD ($) Position
Restructuring Cost And Reserve [Line Items]
Severance related payments	$ 6.7			$ 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					$ 5.5
2017 Restructuring Program [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring costs, description					involved the elimination of approximately 350 positions by the end of the fourth quarter of 2017 across certain 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
2016 Restructuring Program [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring costs, description					involved the elimination of approximately 320 positions across all of the Company’s theme parks and corporate headquarters.
Number of positions eliminated | Position						320
Restructuring and other related costs incurred to date						$ 8.9