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Variable Interest Entities, Contingent Liabilities and Consolidated Joint Ventures - MCB Real Estate, LLC (Details)	3 Months Ended
	Mar. 31, 2017 USD ($) item	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)
Consolidated VIEs Carrying Amount of Assets and Liabilities
Mortgages payable	$ 392,656,000		$ 394,898,000
Real estate expenses	$ 2,704,000	$ 2,175,000
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	$ 7,434,000
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	$ 10,483,000
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	2,937,000
Mortgages payable	4,367,000
Net book value of property	7,124,000
Real estate expenses	70,000	114,000
Mortgage interest	43,000	$ 43,000
Impairment charge	$ 0

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Amount of expense incurred and directly related to generating revenue from leased and rented property or equipment.

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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