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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS Percentage
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Revenues    
Lime and limestone operations (as a percent) 97.70%uslm_LimeAndLimestoneOperationsNetPercentage 95.50%uslm_LimeAndLimestoneOperationsNetPercentage
Natural gas (as a percent) 2.30%uslm_NaturalGasInterestsNetPercentage 4.50%uslm_NaturalGasInterestsNetPercentage
Total revenues (as a percent) 100.00%uslm_RevenueNetPercentage 100.00%uslm_RevenueNetPercentage
Cost of revenues:    
Labor and other operating expenses (as a percent) 67.60%uslm_LaborAndOtherOperatingExpensesNetPercentage 66.90%uslm_LaborAndOtherOperatingExpensesNetPercentage
Depreciation, depletion and amortization (as a percent) 12.90%uslm_DepreciationDepletionAndAmortizationNetPercentage 9.70%uslm_DepreciationDepletionAndAmortizationNetPercentage
Total cost of revenues (as a percent) 80.50%uslm_CostOfGoodsAndServicesSoldNetPercentage 76.60%uslm_CostOfGoodsAndServicesSoldNetPercentage
Gross profit (as a percent) 19.50%uslm_GrossProfitNetPercentage 23.40%uslm_GrossProfitNetPercentage
Selling, general and administrative expenses (as a percent) 8.00%uslm_SellingGeneralAndAdministrativeExpensesNetPercentage 6.00%uslm_SellingGeneralAndAdministrativeExpensesNetPercentage
Operating profit (as a percent) 11.50%uslm_OperatingProfitNetPercentage 17.40%uslm_OperatingProfitNetPercentage
Other expenses (income):    
Interest expense (as a percent) 1.00%uslm_InterestExpenseNetPercentage 1.10%uslm_InterestExpenseNetPercentage
Other income, net (as a percent) 0.00%uslm_OtherNonoperatingIncomeExpenseNetPercentage 0.00%uslm_OtherNonoperatingIncomeExpenseNetPercentage
Total other expense (income) (as a percent) 1.00%uslm_NonoperatingIncomeExpenseNetPercentage 1.10%uslm_NonoperatingIncomeExpenseNetPercentage
Income before income taxes (as a percent) 10.50%uslm_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestmentsNetPercentage 16.30%uslm_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestmentsNetPercentage
Income tax expense (as a percent) 2.60%uslm_IncomeTaxExpenseBenefitNetPercentage 4.10%uslm_IncomeTaxExpenseBenefitNetPercentage
Net income (as a percent) 7.90%uslm_NetIncomeLossAvailableToCommonStockholdersBasicNetPercentage 12.20%uslm_NetIncomeLossAvailableToCommonStockholdersBasicNetPercentage