Summary of Significant Accounting Policies - Estimated Useful Lives of Assets (Detail)	12 Months Ended
	Dec. 31, 2014
Buildings and Improvements | Minimum
Property and Equipment, Net
Estimated useful lives of the assets	10 years
Buildings and Improvements | Maximum
Property and Equipment, Net
Estimated useful lives of the assets	45 years
Land Improvements | Minimum
Property and Equipment, Net
Estimated useful lives of the assets	10 years
Land Improvements | Maximum
Property and Equipment, Net
Estimated useful lives of the assets	45 years
Leasehold Interest in Land
Property and Equipment, Net
Estimated useful lives of the assets	25 years
Airplanes | Minimum
Property and Equipment, Net
Estimated useful lives of the assets	18 years
Airplanes | Maximum
Property and Equipment, Net
Estimated useful lives of the assets	20 years
Furniture, Fixtures and Equipment | Minimum
Property and Equipment, Net
Estimated useful lives of the assets	3 years
Furniture, Fixtures and Equipment | Maximum
Property and Equipment, Net
Estimated useful lives of the assets	20 years