Estimated Useful Lives used to Depreciate Real Property Assets (Detail)	12 Months Ended
Dec. 31, 2014
Land
Property, Plant and Equipment [Line Items]
Standard Depreciable Life	Not Depreciated
Buildings
Property, Plant and Equipment [Line Items]
Standard Depreciable Life	35 years
Site Improvements
Property, Plant and Equipment [Line Items]
Standard Depreciable Life	10 years

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.

No definition available.

Name:	us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration