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Revolving Credit Facilities - Additional Information (Detail) - Unsecured Debt [Member] - Revolving Credit Facility [Member] - USD ($)
12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Debt Instrument [Line Items]    
Covenant compliance The Company was in compliance with these financial covenants at December 31, 2018 and 2017.  
LIBOR [Member]    
Debt Instrument [Line Items]    
Specified spread line of credit facility 1.20%  
Alternative Base Rate [Member]    
Debt Instrument [Line Items]    
Specified spread line of credit facility 0.20%  
J.P. Morgan Chase Bank, N.A., Wells Fargo Securities, LLC, Citizens Bank, N.A., RBC Capital Markets and U.S. Bank National Association [Member]    
Debt Instrument [Line Items]    
Lines of Credit Maturity Date 2022-09  
Line of credit facility competitive bid option on periodic interest rates up to 50% of the facility  
Facility fee 0.25%  
Revolving credit facility maturity extension option two six-month options to extend the maturity to September 2022 upon the Company’s request (subject to satisfaction of certain conditions)  
J.P. Morgan Chase Bank, N.A., Wells Fargo Securities, LLC, Citizens Bank, N.A., RBC Capital Markets and U.S. Bank National Association [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Unsecured revolving credit facility borrowing capacity $ 950,000,000  
Accordion feature $ 1,450,000,000  
PNC Bank National Association [Member]    
Debt Instrument [Line Items]    
Lines of Credit Maturity Date 2021-09  
Unsecured revolving credit facility $ 20,000,000 $ 50,000,000
PNC Bank National Association [Member] | Retail Value Inc. [Member]    
Debt Instrument [Line Items]    
Guaranty borrowing capacity $ 30,000,000