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Stock-Based Compensation (Detail)
12 Months Ended
Dec. 31, 2014
Jun. 06, 2005
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common stock, shares reserved for future issuance 4,756,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance  
2005 Long Term Incentive Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized   4,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= nls_A2005LongTermIncentivePlanMember
Reduction in number of shares available for issuance due to settlement of stock appreciation rights and stock unit or performance unit award 2nls_SharebasedCompensationArrangementbySharebasedPaymentAwardReductioninNumberofSharesAvailableforGrantduetoSettlementofRightsandUnitAward
/ us-gaap_PlanNameAxis
= nls_A2005LongTermIncentivePlanMember
 
Reduction in number of shares available for issuance due to settlement of stock option award 1nls_SharebasedCompensationArrangementbySharebasedPaymentAwardReductioninNumberofSharesAvailableforGrantDuetoSettlementofStockOptionAward
/ us-gaap_PlanNameAxis
= nls_A2005LongTermIncentivePlanMember
 
Shares available for issuance 3,700,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= nls_A2005LongTermIncentivePlanMember
 
Maximum aggregate shares of common stock subject to stock options, appreciation rights, restricted stock or performance stock unit awards 1,000,000.0nls_SharebasedCompensationArrangementbySharebasedPaymentAwardMaximumNumberofAggregateSharesofCommonStockbeSubjectedtoAwardsGrantedtoPersoninYear
/ us-gaap_PlanNameAxis
= nls_A2005LongTermIncentivePlanMember
 
Stock Options [Member] | 2005 Long Term Incentive Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected life (years) 7 years  
Stock Options [Member] | Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 3 years  
Stock Options [Member] | Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 4 years