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Financing Activity - Mortgage Loan Activity Additional Detail (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Mortgage Loan Activity [Line Items]      
Common Stock, Dividends, Per Share, Cash Paid $ 0.21    
Maximum Unsecured Borrowing Amount Under Unencumbered Debt Yield Covenant $ 242,500    
Carrying Value Of Net Losses Associated With Interest Rate Swaps 1,400    
Derivative, Net Liability Position, Aggregate Fair Value 834    
Termination value 1,000    
Repayments of Secured Debt 150,000 $ 139,843  
Two Thousand Thirteen Revolving Credit Facility [Member]      
Mortgage Loan Activity [Line Items]      
Letters of Credit Outstanding, Amount 15,800    
Secured Debt [Member]      
Mortgage Loan Activity [Line Items]      
Debt Issuance Costs, Line of Credit Arrangements, Net $ 4,200   $ 4,500