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Summary of Accounting Policies (Revenue Recognition) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Deferred Revenue Arrangement [Line Items]    
Accrued rebates payable 6.1hnh_AccruedRebatesPayable $ 5.4hnh_AccruedRebatesPayable
Minimum | Rental Revenues    
Deferred Revenue Arrangement [Line Items]    
Rental period (in months) 3 months  
Maximum | Rental Revenues    
Deferred Revenue Arrangement [Line Items]    
Rental period (in months) 6 months