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Real Estate Properties - Merger With Select Income REIT (Details)
$ / shares in Units, $ in Thousands, ft² in Millions
Dec. 31, 2018
USD ($)
ft²
property
Dec. 27, 2018
shares
Oct. 09, 2018
USD ($)
$ / shares
shares
SIR      
Business Acquisition [Line Items]      
Number of properties acquired | property 99    
Rentable area of properties (in square feet) | ft² 16.5    
Consideration transferred $ 2,415,053    
Closing costs 27,497    
Payments for closing costs 14,508    
Debt assumed 1,719,772    
SIR | SIR      
Business Acquisition [Line Items]      
Payments for closing costs $ 12,989    
Underwritten public offering | Common shares      
Business Acquisition [Line Items]      
Shares sold (in shares) | shares     24,918,421
Price per share (in dollars per share) | $ / shares     $ 18.25
Proceeds from sale of shares     $ 435,125
ILPT | SIR      
Business Acquisition [Line Items]      
Shares holding (in shares) | shares   45,000,000