Summary of Significant Accounting Policies - Useful Lives of Depreciable Assets (Detail)	12 Months Ended
	Dec. 31, 2014
Buildings and Improvements | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	7 years
Buildings and Improvements | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	50 years
Land Improvements | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	3 years
Land Improvements | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	20 years
Furniture, Fixtures and Equipment | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	4 years
Furniture, Fixtures and Equipment | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	10 years