Investments in Unconsolidated Joint Ventures - Additional Information (Details)	Dec. 31, 2016	Dec. 31, 2015
712 Fifth Avenue [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method ownership percentage	50.00%	50.00%
Oder-Center, Germany [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method ownership percentage	9.50%	9.50%

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant