Summary of Significant Accounting Policies - Estimated Useful Lives of Assets (Detail)	12 Months Ended
	Dec. 31, 2012
Maximum [Member] | Land improvements, building and building improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life of assets	40 years
Maximum [Member] | Furniture, fixtures and equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life of assets	15 years
Maximum [Member] | Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life of assets	10 years
Maximum [Member] | Transportation [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life of assets	20 years
Minimum [Member] | Land improvements, building and building improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life of assets	15 years
Minimum [Member] | Furniture, fixtures and equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life of assets	3 years
Minimum [Member] | Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life of assets	5 years
Minimum [Member] | Transportation [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life of assets	5 years