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Acquisition (Details) (Houston, USD $)
1 Months Ended
Dec. 31, 2014
Houston
 
Acquisition  
Assets purchased $ 3,800,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= uslm_HoustonMember
Land and buildings purchased 1,700,000uslm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLandAndBuildings
/ us-gaap_BusinessAcquisitionAxis
= uslm_HoustonMember
Trucks and trailers and other equipment purchased 2,100,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedEquipment
/ us-gaap_BusinessAcquisitionAxis
= uslm_HoustonMember
Acquisition-related costs $ 31,000us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= uslm_HoustonMember