Real Estate and Accumulated Depreciation - Estimated Useful Lives of Assets (Detail)	12 Months Ended
Dec. 31, 2013
Building \| Minimum
Property Plant and Equipment Estimated Useful Lives [Line Items]
Property plant equipment useful life	35 years
Building \| Maximum
Property Plant and Equipment Estimated Useful Lives [Line Items]
Property plant equipment useful life	50 years
Building Components \| Maximum
Property Plant and Equipment Estimated Useful Lives [Line Items]
Property plant equipment useful life	20 years
Tenant Improvements
Property Plant and Equipment Estimated Useful Lives [Line Items]
Tenant improvements	The shorter of the term of the lease or the useful life of the improvements

Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment).

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-URI http://asc.fasb.org/subtopic&trid=2155824

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration