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Summary of Significant Accounting Policies - Schedule of Carrying Amount and Fair Value (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Assets        
Cash and cash equivalents, Carrying Amount $ 20,892 $ 38,301 $ 14,763 $ 3,334
Restricted cash, Carrying Amount 5,518 5,413    
Derivative assets, Carrying Amount 3,867 24    
Cash and cash equivalents, Estimated Fair Value 20,892 38,301    
Restricted cash, Estimated Fair Value 5,518 5,413    
Derivative assets, Estimated Fair Value 3,867 24    
Liabilities        
Indebtedness, net of unamortized discount and deferred financing costs 743,817 966,611    
Mortgages        
Liabilities        
Indebtedness, net of unamortized discount and deferred financing costs 596,537 581,038    
Indebtedness, net of unamortized discount and deferred financing costs, estimated fair value 588,523 589,320    
Secured Credit Facility        
Liabilities        
Indebtedness, net of unamortized discount and deferred financing costs 147,280 [1],[2] 267,155 [3]    
Indebtedness, net of unamortized discount and deferred financing costs, estimated fair value $ 150,000 271,500    
Term Loan        
Liabilities        
Indebtedness, net of unamortized discount and deferred financing costs   118,418    
Indebtedness, net of unamortized discount and deferred financing costs, estimated fair value   $ 120,000    
[1] As of December 31, 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 $312,500, of which $150,000 was outstanding as of December 31, 2016.
[3] The secured credit facility total capacity was $325,000, of which $271,500 was outstanding as of December 31, 2015