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Business Segments (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
segment
Mar. 31, 2014
Business Segments    
Number of business segments 2us-gaap_NumberOfOperatingSegments  
Business segments    
Revenues $ 30,064us-gaap_SalesRevenueNet $ 36,691us-gaap_SalesRevenueNet
Depreciation, depletion and amortization 3,884us-gaap_CostOfGoodsSoldDepreciationDepletionAndAmortization 3,556us-gaap_CostOfGoodsSoldDepreciationDepletionAndAmortization
Gross profit 5,864us-gaap_GrossProfit 8,592us-gaap_GrossProfit
Capital expenditures 3,424us-gaap_PaymentsToAcquireProductiveAssets 2,856us-gaap_PaymentsToAcquireProductiveAssets
Lime and limestone operations    
Business segments    
Revenues 29,362us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= uslm_LimeAndLimestoneOperationsSegmentMember
35,051us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= uslm_LimeAndLimestoneOperationsSegmentMember
Depreciation, depletion and amortization 3,692us-gaap_CostOfGoodsSoldDepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= uslm_LimeAndLimestoneOperationsSegmentMember
3,332us-gaap_CostOfGoodsSoldDepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= uslm_LimeAndLimestoneOperationsSegmentMember
Gross profit 5,697us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= uslm_LimeAndLimestoneOperationsSegmentMember
7,662us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= uslm_LimeAndLimestoneOperationsSegmentMember
Capital expenditures 3,420us-gaap_PaymentsToAcquireProductiveAssets
/ us-gaap_StatementBusinessSegmentsAxis
= uslm_LimeAndLimestoneOperationsSegmentMember
2,852us-gaap_PaymentsToAcquireProductiveAssets
/ us-gaap_StatementBusinessSegmentsAxis
= uslm_LimeAndLimestoneOperationsSegmentMember
Natural gas interests    
Business segments    
Revenues 702us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= uslm_NaturalGasInterestsSegmentMember
1,640us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= uslm_NaturalGasInterestsSegmentMember
Depreciation, depletion and amortization 192us-gaap_CostOfGoodsSoldDepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= uslm_NaturalGasInterestsSegmentMember
224us-gaap_CostOfGoodsSoldDepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= uslm_NaturalGasInterestsSegmentMember
Gross profit 167us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= uslm_NaturalGasInterestsSegmentMember
930us-gaap_GrossProfit
/ us-gaap_StatementBusinessSegmentsAxis
= uslm_NaturalGasInterestsSegmentMember
Capital expenditures $ 4us-gaap_PaymentsToAcquireProductiveAssets
/ us-gaap_StatementBusinessSegmentsAxis
= uslm_NaturalGasInterestsSegmentMember
$ 4us-gaap_PaymentsToAcquireProductiveAssets
/ us-gaap_StatementBusinessSegmentsAxis
= uslm_NaturalGasInterestsSegmentMember