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Summary of Significant Accounting Policies - Schedule of Carrying Amount and Fair Value (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Assets        
Cash and cash equivalents, Carrying Amount $ 10,128 $ 20,892 $ 29,247 $ 38,301
Restricted cash, Carrying Amount 6,665 5,518    
Derivative assets, Carrying Amount 3,581 3,867    
Cash and cash equivalents, Estimated Fair Value 10,128 20,892    
Restricted cash, Estimated Fair Value 6,665 5,518    
Derivative assets, Estimated Fair Value 3,581 3,867    
Liabilities        
Indebtedness, net of unamortized discount and deferred financing costs 731,625 743,817    
Secured Credit Facility        
Liabilities        
Indebtedness, net of unamortized discount and deferred financing costs [1]   147,280    
Indebtedness, net of unamortized discount and deferred financing costs, estimated fair value   150,000    
Unsecured Credit Facility        
Liabilities        
Indebtedness, net of unamortized discount and deferred financing costs [2],[3] 157,163      
Indebtedness, net of unamortized discount and deferred financing costs, estimated fair value 159,690      
Mortgages        
Liabilities        
Indebtedness, net of unamortized discount and deferred financing costs 574,462 596,537    
Indebtedness, net of unamortized discount and deferred financing costs, estimated fair value $ 565,954 $ 588,523    
[1] The secured credit facility total capacity was $312,500, of which $150,000 was outstanding as of December 31, 2016.
[2] As of September 30, 2017, IRT maintained a float-to-fixed interest rate swap with a $150,000 notional amount. This swap, which expires on June 17, 2021 and has a fixed rate of 1.1325%, has converted $150,000 of our floating rate debt to fixed rate debt.
[3] The unsecured credit facility total capacity is $300,000, of which $159,690 was outstanding as of September 30, 2017.