Real Estate Assets (Details 2) (Undeveloped land in the Lehigh Valley of Pennsylvania, Land, USD $) In Thousands, unless otherwise specified	0 Months Ended
Dec. 28, 2012 item sqft acre
Undeveloped land in the Lehigh Valley of Pennsylvania \| Land
Acquisitions
Number of acres purchased	49
Cash paid	$ 7,119
Number of industrial buildings to be developed	2
Area, square feet	530,000

The cash outflow from the acquisition of property as primarily intended to generate income for its owner.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

Name:	us-gaap_PaymentsToAcquireCommercialRealEstate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration