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Discontinued Operations - Additional Information (Detail) - USD ($)
$ in Thousands
9 Months Ended
Oct. 05, 2016
Sep. 27, 2016
Sep. 30, 2017
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]      
Proceeds form sale of shares     $ 38,941
IRT      
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]      
Purchase price to be paid by IRT   $ 43,000  
IRT | Common Shares      
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]      
Number of shares sold to IRT 7,269,719    
Proceeds form sale of shares $ 62,156