Investments in Partnerships (Narrative) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014 Property	Dec. 01, 2014
Mortgage Loans on Real Estate [Line Items]
Number Of Properties Securing Mortgage Debt	8
Number of fixed rate mortgage loans payable	5
Number of variable rate mortgage loans payable	3
Leigh Valley Associates, LP
Mortgage Loans on Real Estate [Line Items]
Partnership investment, ownership interest	50.00%
Mortgage Loan [Member]
Mortgage Loans on Real Estate [Line Items]
Property under development	2
Mortgage loan due date	2023
Weighted average interest rate of all partnership mortgage loans	5.08%
Fixed Interest Rate [Member] \| Mortgage Loan [Member]
Mortgage Loans on Real Estate [Line Items]
Interest rate, minimum	5.00%
Interest rate, maximum	5.88%
Weighted average interest rate on mortgage loan	5.51%
Variable Interest Rate [Member] \| Mortgage Loan [Member]
Mortgage Loans on Real Estate [Line Items]
Interest rate, minimum	1.66%
Interest rate, maximum	3.26%
Weighted average interest rate on mortgage loan	3.18%
Whitehall Mall [Member] \| Strip And Power Center [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage assumed by buyer		$ 5.1

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Installment Payments Due Date

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Number Of Fixed Rate Mortgage Loans Payable

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Number Of Properties Secured Mortgage Debt

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Number Of Properties Under Development

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Number Of Variable Rate Mortgage Loans Payable

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Weighted Average Interest Rate On Variable Rate Debt

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Contractual interest rate for funds borrowed, under the debt agreement.

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

-Publisher SEC

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-Number 210

-Section 02

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Maximum contractual interest rate for funds borrowed, under the debt agreement.

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Minimum contractual interest rate for funds borrowed, under the debt agreement.

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

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-Name Accounting Standards Codification

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