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Related Party Transactions (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Apr. 13, 2017
Apr. 13, 2016
Related Party Transaction        
Interest income $ 9 $ 4    
Parent Issuer UHS        
Related Party Transaction        
Interest income 9 4    
IPC | General Advisory And Management Services        
Related Party Transaction        
Specified amount of annual fees for ongoing advisory and management services $ 500      
Annual fee for ongoing advisory and management services as a percentage of adjusted EBITDA 0.75%      
Amount incurred $ 300 200    
Executive Officer | Promissory Note Agreement        
Related Party Transaction        
Interest income $ 9 $ 4    
Executive Officer | Promissory Note Agreement | Other Noncurrent Assets        
Related Party Transaction        
Note receivable     $ 900 $ 1,000
Executive Officer | Promissory Note Agreement | Minimum        
Related Party Transaction        
Interest rate 1.45%      
Executive Officer | Promissory Note Agreement | Maximum        
Related Party Transaction        
Interest rate 2.12%