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Summary of Significant Accounting Policies (Detail 4) | 12 Months Ended
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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

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- Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |