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Combined Guarantor Subsidiaries - Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items]      
Restricted cash related to mortgage escrows [1] $ 24,282,000 $ 31,977,000  
Net deferred financing costs 20,071,000    
Guarantor Subsidiaries      
Condensed Financial Statements, Captions [Line Items]      
Amortization of intangible assets 626,000 726,000  
Estimated total net amortization expense of intangible assets for remainder of 2019 1,255,000    
Estimated total net amortization expense of intangible assets in 2020 1,195,000    
Estimated total net amortization expense of intangible assets in 2021 1,241,000    
Estimated total net amortization expense of intangible assets in 2022 1,020,000    
Estimated total net amortization expense of intangible assets in 2023 706,000    
Estimated total net amortization expense of intangible assets in 2024 620,000    
Interest expense capitalized 95,000 188,000  
Restricted cash related to mortgage escrows 3,856,000 2,970,000 $ 7,139,000
Net deferred financing costs 299,000   361,000
Amortization expense related to deferred financing costs 62,000 $ 77,000  
Accumulated amortization of deferred financing costs 1,154,000   $ 1,092,000
Income tax provision $ 0    
Concentration risk (less than)   4.40%  
Building | Guarantor Subsidiaries      
Condensed Financial Statements, Captions [Line Items]      
Useful life of property, plant and equipment 40 years    
Minimum | Improvements | Guarantor Subsidiaries      
Condensed Financial Statements, Captions [Line Items]      
Useful life of property, plant and equipment 10 years    
Minimum | Equipment and Fixtures | Guarantor Subsidiaries      
Condensed Financial Statements, Captions [Line Items]      
Useful life of property, plant and equipment 7 years    
Maximum | Improvements | Guarantor Subsidiaries      
Condensed Financial Statements, Captions [Line Items]      
Useful life of property, plant and equipment 20 years    
Maximum | Equipment and Fixtures | Guarantor Subsidiaries      
Condensed Financial Statements, Captions [Line Items]      
Useful life of property, plant and equipment 10 years    
Customer Concentration Risk | Sales Revenue, Net | Guarantor Subsidiaries      
Condensed Financial Statements, Captions [Line Items]      
Concentration risk (less than) 4.10%    
[1] Included in intangible lease assets and other assets in the condensed consolidated balance sheets.