Summary of Significant Accounting Policies - Estimated Useful Lives for Various Asset (Detail)	12 Months Ended
	Dec. 31, 2014
Land and Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives, description	Non-depreciating assets
Buildings [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives, years	25 years
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives, years	5 years
Computer Equipment and Software [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives, years	5 years
Other Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives, years	5 years
Vehicles [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives, years	5 years
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives, years	15 years