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Variable Interest Entities, Contingent Liabilities and Consolidated Joint Ventures - MCB Real Estate, LLC (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) item	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Consolidated VIEs Carrying Amount of Assets and Liabilities
Mortgages payable	$ 395,284,000		$ 395,284,000		$ 394,898,000
Net book value of property	8,516,000		8,516,000
Real estate expenses	2,371,000	$ 2,159,000	$ 5,075,000	$ 4,334,000
Consolidated JV
Consolidated VIEs Carrying Amount of Assets and Liabilities
Number of joint ventures with controlling interest | item			6
Other Consolidated JV
Consolidated VIEs Carrying Amount of Assets and Liabilities
Number of joint ventures with controlling interest | item			2
Investment in consolidated joint ventures	7,211,000		$ 7,211,000
MCB Real Estate LLC And Its Affiliates | Consolidated JV
Consolidated VIEs Carrying Amount of Assets and Liabilities
Number of joint ventures with controlling interest | item			4
Investment in consolidated joint ventures	9,726,000		$ 9,726,000
MCB Real Estate LLC And Its Affiliates | Consolidated JV | Pathmark supermarket in Philadelphia, Pennsylvania
Consolidated VIEs Carrying Amount of Assets and Liabilities
Investment in consolidated joint ventures	2,815,000		2,815,000
Mortgages payable	4,337,000		4,337,000
Net book value of property	7,083,000		7,083,000
Real estate expenses	48,000	58,000	118,000	172,000
Mortgage interest	$ 43,000	$ 44,000	85,000	$ 87,000
Impairment charge			$ 0

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