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Summary of Significant Accounting Policies - Schedule of Carrying Amount and Fair Value (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Dec. 31, 2015
Assets        
Cash and cash equivalents, Carrying Amount $ 6,271 $ 20,892 $ 28,051 $ 38,301
Restricted cash, Carrying Amount 5,690 5,518    
Derivative assets, Carrying Amount 3,619 3,867    
Cash and cash equivalents, Estimated Fair Value 6,271 20,892    
Restricted cash, Estimated Fair Value 5,690 5,518    
Derivative assets, Estimated Fair Value 3,619 3,867    
Liabilities        
Indebtedness, net of unamortized discount and deferred financing costs 764,521 743,817    
Unsecured Credit Facility        
Liabilities        
Indebtedness, net of unamortized discount and deferred financing costs 189,507 [1],[2] 147,280    
Indebtedness, net of unamortized discount and deferred financing costs, estimated fair value 192,190 150,000    
Mortgages        
Liabilities        
Indebtedness, net of unamortized discount and deferred financing costs 575,014 596,537    
Indebtedness, net of unamortized discount and deferred financing costs, estimated fair value $ 566,073 $ 588,523    
[1] As of June 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.
[2] The secured credit facility total capacity is $300,000, of which $192,190 was outstanding as of June 30, 2017.