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Description of Business and Significant Accounting Policies (Details)
 12 Months Ended
Dec. 31, 2020
USD ($)
segment
financial_institution
Dec. 31, 2019
USD ($)
financial_institution
Dec. 31, 2018
USD ($)
Schedule of Accounting Policies [Line Items]      
Renewal term 1 year    
Number of reportable segments | segment 2    
Marketable securities $ 125,012,000 $ 90,711,000  
Unrealized gains (losses) from marketable securities $ 2,600,000 2,800,000 $ (800,000)
Amortization period of inventories and supplies 24 months    
Depreciation $ 10,100,000 9,700,000 4,900,000
Advertising expense 0 0 0
Goodwill and intangible asset impairment $ 0 $ 0 0
Number of financial institutions holding cash and cash equivalents and marketable securities | financial_institution 1 1  
Revenues $ 1,760,303,000 $ 1,840,778,000 2,002,601,000
Genesis      
Schedule of Accounting Policies [Line Items]      
Accounts receivable 22,500,000    
Notes receivable 21,300,000    
Customer Concentration Risk | Revenue from Contract with Customer Benchmark | Genesis      
Schedule of Accounting Policies [Line Items]      
Revenues $ 258,700,000 $ 287,800,000 $ 386,700,000
Concentration risk, percentage 14.70% 15.60% 19.30%
Minimum      
Schedule of Accounting Policies [Line Items]      
Cancellation notice period 30 days    
Initial period preceding cancellation notice 60 days    
Typical maturity 1 year    
Minimum | Housekeeping and Dietary equipment      
Schedule of Accounting Policies [Line Items]      
Property plant and equipment, useful life 5 years    
Minimum | Computer hardware and software      
Schedule of Accounting Policies [Line Items]      
Property plant and equipment, useful life 3 years    
Minimum | Vehicles      
Schedule of Accounting Policies [Line Items]      
Property plant and equipment, useful life 5 years    
Maximum      
Schedule of Accounting Policies [Line Items]      
Cancellation notice period 90 days    
Initial period preceding cancellation notice 120 days    
Typical maturity 3 years    
Maximum | Housekeeping and Dietary equipment      
Schedule of Accounting Policies [Line Items]      
Property plant and equipment, useful life 7 years    
Maximum | Computer hardware and software      
Schedule of Accounting Policies [Line Items]      
Property plant and equipment, useful life 7 years    
Maximum | Vehicles      
Schedule of Accounting Policies [Line Items]      
Property plant and equipment, useful life 10 years