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Mortgage Loan Receivable (Details) - USD ($)
$ in Thousands
Jun. 03, 2013
Mar. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]      
Mortgage loan receivable   $ 3,310 $ 3,331
March 31, 2016 | US Airways | PKY W. Rio Salado, LLC      
Debt Instrument [Line Items]      
Company's ownership (as a percent) 25.40%    
Unconsolidated Properties | March 31, 2016      
Debt Instrument [Line Items]      
Company's ownership interest (as a percent) 74.60%    
First Mortgage | March 31, 2016 | PKY W. Rio Salado, LLC      
Debt Instrument [Line Items]      
Mortgage secured for properties $ 13,900    
Fixed interest rate on mortgage loans on real estate (as a percent) 3.00%    
Mortgage Loans on real estate   13,000 13,100
PKY W. Rio Salado, LLC | March 31, 2016      
Debt Instrument [Line Items]      
Mortgage loan receivable   $ 3,300 $ 3,300