Subsequent Events (Details) (Subsequent Event [Member], Floating Rate Debt, One Grand Central Place - Third Lien [Member], Mortgages [Member], USD $)	Apr. 01, 2015
Subsequent Event [Member] \| Floating Rate Debt, One Grand Central Place - Third Lien [Member] \| Mortgages [Member]
Subsequent Event [Line Items]
Debt instrument face amount	$ 91,000,000.0

Face (par) amount of debt instrument at time of issuance.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant