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Mortgage Loan Receivable (Details) - USD ($)
$ in Millions
Jun. 03, 2013
Jun. 30, 2015
US Airways Building    
Debt Instrument [Line Items]    
Interest rate on mortgage loans on real estate 3.00%  
PKY W. Rio Salado, LLC | US Airways Building    
Debt Instrument [Line Items]    
Mortgage secured for properties in a business acquisition $ 3.4  
Unconsolidated Properties | US Airways Building    
Debt Instrument [Line Items]    
Ownership percentage in equity investments (in percent) 74.58% 74.58%
U.S. Airways | Unconsolidated Properties | US Airways Building    
Debt Instrument [Line Items]    
Company's Ownership %   25.40%