Commitments and Contingencies - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($) a	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Contingencies And Commitments [Line Items]
Rental expense related to continuing operations for operating leases	$ 12.4	$ 12.3	$ 14.7
Osceola County [Member]
Contingencies And Commitments [Line Items]
Operating lease agreement period	75 years
Land area covered under operating lease agreement in acres | a	65.3
Annual base payment for operating lease	$ 4.0
Percentage of escalation of base rent	3.00%
Annual base lease expense for operating lease	$ 9.4	9.4	9.4
Expiration date of lease under extension	Jan. 31, 2101
Contingent rentals	$ 2.2	2.0	2.0
Non cash lease expense	$ 5.2	$ 5.4	$ 5.5