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Summary of Significant Accounting Policies - Schedule of Carrying Amount and Fair Value (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Dec. 31, 2014
Assets        
Cash and cash equivalents, Carrying Amount $ 29,247 $ 38,301 $ 16,939 $ 14,763
Restricted cash, Carrying Amount 8,028 5,413    
Derivative assets, Carrying Amount   24    
Cash and cash equivalents, Estimated Fair Value 29,247 38,301    
Restricted cash, Estimated Fair Value 8,028 5,413    
Derivative assets, Estimated Fair Value   24    
Liabilities        
Indebtedness, net of unamortized discount and deferred financing costs 880,581 966,611    
Derivative liabilities, Carrying Amount 696      
Derivative liabilities, Estimated Fair Value 696      
Mortgages        
Liabilities        
Indebtedness, net of unamortized discount and deferred financing costs 596,956 581,038    
Indebtedness, net of unamortized discount and deferred financing costs, estimated fair value 605,746 589,320    
Secured Credit Facility        
Liabilities        
Indebtedness, net of unamortized discount and deferred financing costs 244,019 [1],[2] 267,155 [3]    
Indebtedness, net of unamortized discount and deferred financing costs, estimated fair value 247,335 271,500    
Term Loan        
Liabilities        
Indebtedness, net of unamortized discount and deferred financing costs 39,606 [1] 118,418    
Indebtedness, net of unamortized discount and deferred financing costs, estimated fair value $ 40,000 $ 120,000    
[1] As of September 30, 2016, 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 1.145%, has converted $150,000 of our floating rate debt to fixed rate debt.
[2] The secured credit facility total capacity is $325,000, of which $247,335 was outstanding as of September 30, 2016.
[3] The secured credit facility total capacity was $325,000, of which $271,500 was outstanding as of December 31, 2015.