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Summary of Significant Accounting Policies - Intangible Assets and Goodwill (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]      
Goodwill and intangible asset impairment $ 0 $ 498,000 $ 3,653,000
Facility trade name      
Finite-Lived Intangible Assets [Line Items]      
Finite-lived intangible asset, useful life 30 years    
Customer relationships      
Finite-Lived Intangible Assets [Line Items]      
Finite-lived intangible asset, useful life 20 years    
Minimum | Assembled occupancy      
Finite-Lived Intangible Assets [Line Items]      
Finite-lived intangible asset, useful life 4 months    
Maximum | Assembled occupancy      
Finite-Lived Intangible Assets [Line Items]      
Finite-lived intangible asset, useful life 8 months