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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2020
Feb. 12, 2021
Jun. 30, 2020
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2020    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Trading Symbol IRT    
Entity Registrant Name INDEPENDENCE REALTY TRUST, INC.    
Entity Central Index Key 0001466085    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer Yes    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   101,856,947  
Entity Public Float     $ 1,084,726,741
Entity File Number 001-36041    
Entity Tax Identification Number 26-4567130    
Entity Address, Address Line One 1835 Market Street    
Entity Address, Address Line Two Suite 2601    
Entity Address, City or Town Philadelphia    
Entity Address, State or Province PA    
Entity Address, Postal Zip Code 19103    
City Area Code 267    
Local Phone Number 270-4800    
Entity Interactive Data Current Yes    
Title of 12(b) Security Common stock    
Security Exchange Name NYSE    
Entity Incorporation, State or Country Code MD    
Document Transition Report false    
Document Annual Report true    
ICFR Auditor Attestation Flag true    
Documents Incorporated by Reference Portions of the proxy statement for registrant’s 2021 Annual Meeting of Stockholders are incorporated by reference in Part III of this Form 10-K.