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Description of Business and Significant Accounting Policies (Details)
 1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2013
Jul. 31, 2011
Sep. 30, 2015
Dec. 31, 2015
USD ($)
financial_institution
segment
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Sep. 30, 2014
USD ($)
Property, Plant and Equipment [Line Items]              
Number of financial institutions holding cash and cash equivalents and marketable securities | financial_institution       1      
Service agreement term       1 year      
Number of reportable segments | segment       2      
Notes receivable       $ 6,472,000 $ 10,208,000    
Discounted notes receivable       6,460,000 10,196,000    
Marketable securities       69,496,000      
Unrealized gains from marketable securities       $ 543,000      
Amortization period of inventories and supplies       24 months      
Depreciation       $ 4,419,000 3,946,000 $ 3,373,000  
Impairment loss on goodwill and intangible assets       $ 0 $ 0 $ 0  
Percentage of reduction of Medicare payments to nursing centers   11.10%          
Percentage of reduction of Medicare payments to plans and providers (up to) 2.00%            
Change in Self-Insurance Reserve              
Property, Plant and Equipment [Line Items]              
Self-insurance claims reserve adjustment             $ 37,416,000
Autos And Trucks              
Property, Plant and Equipment [Line Items]              
Useful life       3 years      
Minimum              
Property, Plant and Equipment [Line Items]              
Days to notify cancellation of service       30 days      
Initial period of service term       60 days      
Property and equipment payment terms       24 months      
Percentage of revenue from a major client       3.00%      
Minimum | Change in Self-Insurance Reserve              
Property, Plant and Equipment [Line Items]              
Estimated self-insurance claim close-out period     15 years        
Minimum | Laundry And Linen Equipment Installations              
Property, Plant and Equipment [Line Items]              
Useful life       3 years      
Minimum | Housekeeping, And Office Furniture And Equipment              
Property, Plant and Equipment [Line Items]              
Useful life       3 years      
Maximum              
Property, Plant and Equipment [Line Items]              
Days to notify cancellation of service       90 days      
Initial period of service term       120 days      
Property and equipment payment terms       60 months      
Percentage of revenue from a major client       9.00%      
Maximum | Change in Self-Insurance Reserve              
Property, Plant and Equipment [Line Items]              
Estimated self-insurance claim close-out period     17 years        
Maximum | Laundry And Linen Equipment Installations              
Property, Plant and Equipment [Line Items]              
Useful life       7 years      
Maximum | Housekeeping, And Office Furniture And Equipment              
Property, Plant and Equipment [Line Items]              
Useful life       7 years