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Summary of Significant Accounting Policies - Schedule of Carrying Amount and Fair Value (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Assets        
Cash and cash equivalents, Carrying Amount $ 10,065 $ 20,892 $ 21,924 $ 38,301
Restricted cash, Carrying Amount 5,575 5,518    
Derivative assets, Carrying Amount 4,292 3,867    
Cash and cash equivalents, Estimated Fair Value 10,065 20,892    
Restricted cash, Estimated Fair Value 5,575 5,518    
Derivative assets, Estimated Fair Value 4,292 3,867    
Liabilities        
Indebtedness, net of unamortized discount and deferred financing costs 765,695 743,817    
Secured Credit Facility        
Liabilities        
Indebtedness, net of unamortized discount and deferred financing costs 169,669 [1],[2] 147,280 [3]    
Indebtedness, net of unamortized discount and deferred financing costs, estimated fair value 172,000 150,000    
Mortgages        
Liabilities        
Indebtedness, net of unamortized discount and deferred financing costs 596,026 596,537    
Indebtedness, net of unamortized discount and deferred financing costs, estimated fair value $ 586,100 $ 588,523    
[1] As of March 31, 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 1.145%, has converted $150,000 of our floating rate debt to fixed rate debt.
[2] The secured credit facility total capacity is $312,500, of which $172,000 was outstanding as of March 31, 2017.
[3] The secured credit facility total capacity was $312,500, of which $150,000 was outstanding as of December 31, 2016.