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Other Long-Term Liabilities - Other Long-Term Liabilities (Detail) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Other Liabilities Disclosure [Abstract]    
Environmental $ 7,195,000us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent $ 7,384,000us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent
Unrecognized tax benefits, interest and penalties 558,000sli_UnrecognizedTaxBenefitsInterestAndPenalties 549,000sli_UnrecognizedTaxBenefitsInterestAndPenalties
Long-term incentive plan 431,000sli_LongTermIncentivePlanNoncurrent 558,000sli_LongTermIncentivePlanNoncurrent
Acquisition earn-out, long-term 216,000sli_AcquisitionEarnOutLongTermLiabilities 288,000sli_AcquisitionEarnOutLongTermLiabilities
Other long-term liabilities $ 8,400,000us-gaap_OtherLiabilitiesNoncurrent $ 8,779,000us-gaap_OtherLiabilitiesNoncurrent