Description of the Business and Summary of Significant Accounting Policies - Leases (Details)	Dec. 31, 2018 a
Land in Osceola County, Florida [Member]
Operating Leased Assets [Line Items]
Land area covered under operating lease agreement	65.3
Land in Grapevine, Texas [Member]
Operating Leased Assets [Line Items]
Land area covered under operating lease agreement	10.0