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Financing Activity - Mortgage Loan Activity Additional Detail (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2016
Jun. 30, 2015
Apr. 08, 2016
Mortgage Loan Activity [Line Items]        
Common Stock, Dividends, Per Share, Cash Paid   $ 0.42    
Maximum Unsecured Borrowing Amount Under Unencumbered Debt Yield Covenant $ 252,000 $ 252,000    
Carrying Value Of Net Losses Associated With Interest Rate Swaps 1,800 1,800    
Derivative, Net Liability Position, Aggregate Fair Value 10,300 10,300    
Assets Needed for Immediate Settlement, Aggregate Fair Value (10,900) (10,900)    
Repayments of Secured Debt   280,327 $ 139,137  
Two Thousand Thirteen Revolving Credit Facility [Member]        
Mortgage Loan Activity [Line Items]        
Letters of Credit Outstanding, Amount 7,400 $ 7,400    
Woodland Mall [Member]        
Mortgage Loan Activity [Line Items]        
Mortgage Loans on Real Estate, Face Amount of Mortgages       $ 130,000
Loans Receivable, Basis Spread on Variable Rate       2.00%
Repayments of Debt $ 141,200