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Revenue - Narrative (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Disaggregation of Revenue [Line Items]      
Revenue $ 476,111,000 $ 500,562,000  
Description of timing The significant majority of the Company’s contracts with customers have an initial term of one year or less, with renewable one year service terms, cancellable by either party upon 30 to 90 days' notice after an initial period of 60 to 120 days.    
Renewal term 1 year    
Transferred at Point in Time      
Disaggregation of Revenue [Line Items]      
Contract liabilities $ 0   $ 0
Transferred over Time      
Disaggregation of Revenue [Line Items]      
Contract liabilities $ 0   $ 0
Minimum      
Disaggregation of Revenue [Line Items]      
Cancellation notice period 30 days    
Initial period preceding cancellation notice 60 days    
Maximum      
Disaggregation of Revenue [Line Items]      
Cancellation notice period 90 days    
Initial period preceding cancellation notice 120 days    
Housekeeping      
Disaggregation of Revenue [Line Items]      
Percent of revenue 49.00% 49.00%  
Revenue $ 233,134,000 $ 245,161,000  
Dietary      
Disaggregation of Revenue [Line Items]      
Percent of revenue 51.00% 51.00%  
Revenue $ 242,977,000 $ 255,401,000