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Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
segment
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting Information [Line Items]                      
Number of Reportable Segments                 2us-gaap_NumberOfReportableSegments    
Net sales $ 94,931us-gaap_SalesRevenueNet $ 59,067us-gaap_SalesRevenueNet $ 48,546us-gaap_SalesRevenueNet $ 71,903us-gaap_SalesRevenueNet $ 77,091us-gaap_SalesRevenueNet $ 46,256us-gaap_SalesRevenueNet $ 36,242us-gaap_SalesRevenueNet $ 59,214us-gaap_SalesRevenueNet $ 274,447us-gaap_SalesRevenueNet $ 218,803us-gaap_SalesRevenueNet $ 193,926us-gaap_SalesRevenueNet
Consolidated contribution                 48,255nls_Contribution 30,922nls_Contribution 25,391nls_Contribution
Operating Expenses                 110,421us-gaap_OperatingExpenses 90,753us-gaap_OperatingExpenses 80,449us-gaap_OperatingExpenses
Reconciliation of consolidated contribution to income (loss) from continuing operations:                      
Selling and marketing                 81,059us-gaap_SellingAndMarketingExpense 66,486us-gaap_SellingAndMarketingExpense 58,617us-gaap_SellingAndMarketingExpense
Income tax expense                 (9,841)us-gaap_IncomeTaxExpenseBenefit 32,085us-gaap_IncomeTaxExpenseBenefit 226us-gaap_IncomeTaxExpenseBenefit
Income from continuing operations 10,473us-gaap_IncomeLossFromContinuingOperations 2,664us-gaap_IncomeLossFromContinuingOperations 1,498us-gaap_IncomeLossFromContinuingOperations 5,748us-gaap_IncomeLossFromContinuingOperations 8,432us-gaap_IncomeLossFromContinuingOperations 1,500us-gaap_IncomeLossFromContinuingOperations 32,668us-gaap_IncomeLossFromContinuingOperations 5,524us-gaap_IncomeLossFromContinuingOperations 20,383us-gaap_IncomeLossFromContinuingOperations 48,124us-gaap_IncomeLossFromContinuingOperations 10,642us-gaap_IncomeLossFromContinuingOperations
Depreciation and amortization expense                 4,024us-gaap_DepreciationDepletionAndAmortization 3,344us-gaap_DepreciationDepletionAndAmortization 3,269us-gaap_DepreciationDepletionAndAmortization
Assets 175,654us-gaap_Assets       143,567us-gaap_Assets       175,654us-gaap_Assets 143,567us-gaap_Assets  
UNITED STATES                      
Segment Reporting Information [Line Items]                      
Net sales                 231,230us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_US
181,381us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_US
167,504us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_US
CANADA                      
Segment Reporting Information [Line Items]                      
Net sales                 35,367us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_CA
34,166us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_CA
24,977us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_CA
All Other                      
Segment Reporting Information [Line Items]                      
Net sales                 7,850us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= nls_OtherGeographicRegionsMember
3,256us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= nls_OtherGeographicRegionsMember
1,445us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= nls_OtherGeographicRegionsMember
Direct [Member]                      
Segment Reporting Information [Line Items]                      
Net sales                 175,593us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= nls_DirectMember
136,663us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= nls_DirectMember
124,978us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= nls_DirectMember
Consolidated contribution                 29,345nls_Contribution
/ us-gaap_StatementBusinessSegmentsAxis
= nls_DirectMember
14,126nls_Contribution
/ us-gaap_StatementBusinessSegmentsAxis
= nls_DirectMember
12,479nls_Contribution
/ us-gaap_StatementBusinessSegmentsAxis
= nls_DirectMember
Reconciliation of consolidated contribution to income (loss) from continuing operations:                      
Depreciation and amortization expense                 1,913us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= nls_DirectMember
1,956us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= nls_DirectMember
2,366us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= nls_DirectMember
Assets 25,263us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= nls_DirectMember
      21,249us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= nls_DirectMember
      25,263us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= nls_DirectMember
21,249us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= nls_DirectMember
 
Retail [Member]                      
Segment Reporting Information [Line Items]                      
Net sales                 93,223us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= nls_RetailMember
76,775us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= nls_RetailMember
63,891us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= nls_RetailMember
Consolidated contribution                 13,279nls_Contribution
/ us-gaap_StatementBusinessSegmentsAxis
= nls_RetailMember
11,431nls_Contribution
/ us-gaap_StatementBusinessSegmentsAxis
= nls_RetailMember
7,855nls_Contribution
/ us-gaap_StatementBusinessSegmentsAxis
= nls_RetailMember
Reconciliation of consolidated contribution to income (loss) from continuing operations:                      
Depreciation and amortization expense                 643us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= nls_RetailMember
642us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= nls_RetailMember
825us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= nls_RetailMember
Assets 37,203us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= nls_RetailMember
      32,023us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= nls_RetailMember
      37,203us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= nls_RetailMember
32,023us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= nls_RetailMember
 
Unallocated royalty income [Member]                      
Segment Reporting Information [Line Items]                      
Net sales                 5,631us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= nls_UnallocatedRoyaltyIncomeMember
5,365us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= nls_UnallocatedRoyaltyIncomeMember
5,057us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= nls_UnallocatedRoyaltyIncomeMember
Consolidated contribution                 5,631nls_Contribution
/ us-gaap_StatementBusinessSegmentsAxis
= nls_UnallocatedRoyaltyIncomeMember
5,365nls_Contribution
/ us-gaap_StatementBusinessSegmentsAxis
= nls_UnallocatedRoyaltyIncomeMember
5,057nls_Contribution
/ us-gaap_StatementBusinessSegmentsAxis
= nls_UnallocatedRoyaltyIncomeMember
Unallocated corporate [Member]                      
Reconciliation of consolidated contribution to income (loss) from continuing operations:                      
Depreciation and amortization expense                 1,468us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= nls_UnallocatedCorporateMember
746us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= nls_UnallocatedCorporateMember
78us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= nls_UnallocatedCorporateMember
Assets 113,188us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= nls_UnallocatedCorporateMember
      90,295us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= nls_UnallocatedCorporateMember
      113,188us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= nls_UnallocatedCorporateMember
90,295us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= nls_UnallocatedCorporateMember
 
Less expenses not directly related to segments [Member]                      
Segment Reporting Information [Line Items]                      
Operating Expenses                 (18,101)us-gaap_OperatingExpenses
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember
(15,198)us-gaap_OperatingExpenses
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember
(14,801)us-gaap_OperatingExpenses
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember
Reconciliation of consolidated contribution to income (loss) from continuing operations:                      
Other income (expense), net                 70us-gaap_OtherOperatingIncomeExpenseNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember
315us-gaap_OtherOperatingIncomeExpenseNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember
(174)us-gaap_OtherOperatingIncomeExpenseNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember
Income tax expense                 $ 9,841us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember
$ (32,085)us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember
$ (226)us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember