Annual report pursuant to Section 13 and 15(d)

Retirement And Savings Plan (Details)

v2.4.1.9
Retirement And Savings Plan (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract]      
Percentage of employee contribution 50.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent    
Contribution by employer, per dollar $ 0.50hsni_EmployerContributionPerDollar $ 0.50hsni_EmployerContributionPerDollar $ 0.25hsni_EmployerContributionPerDollar
Percentage of plan participant's deferrals 6.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent 6.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent  
Defined Contribution Plan, Employer Discretionary Contribution Amount 4,600,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount 4,600,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount 2,000,000us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Cash Surrender Value of Life Insurance 500,000us-gaap_CashSurrenderValueOfLifeInsurance    
Deferred Compensation Liability, Current and Noncurrent $ 600,000us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent