Summary of Significant Accounting Policies (Detail 4)	12 Months Ended
Dec. 31, 2014
Buildings \| Minimum
Estimated useful lives of the assets
Estimated useful life of property	25 years
Buildings \| Maximum
Estimated useful lives of the assets
Estimated useful life of property	35 years
Building improvements \| Minimum
Estimated useful lives of the assets
Estimated useful life of property	4 years
Building improvements \| Maximum
Estimated useful lives of the assets
Estimated useful life of property	15 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