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Summary of Significant Accounting Policies - Useful Lives of Depreciable Assets (Detail)	12 Months Ended
	Dec. 31, 2012
Minimum [Member] | Buildings and Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	7 years
Minimum [Member] | Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	3 years
Minimum [Member] | Furniture, Fixtures and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	4 years
Maximum [Member] | Buildings and Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	50 years
Maximum [Member] | Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	20 years
Maximum [Member] | Furniture, Fixtures and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	10 years

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- Details

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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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