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Fair Value of Senior Notes (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Series 2005A Tranche B [Member]  
Fair Value Of Financial Instruments [Line Items]  
Fair Value of Senior Notes $ 58,206us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= exp_SeriesTwoThousandFiveTrancheBMember
Series 2005A Tranche C [Member]  
Fair Value Of Financial Instruments [Line Items]  
Fair Value of Senior Notes 60,911us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= exp_SeriesTwoThousandFiveTrancheCMember
Series 2007A Tranche B [Member]  
Fair Value Of Financial Instruments [Line Items]  
Fair Value of Senior Notes 8,434us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= exp_SeriesTwoThousandSevenTrancheBMember
Series 2007A Tranche C [Member]  
Fair Value Of Financial Instruments [Line Items]  
Fair Value of Senior Notes 25,952us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= exp_SeriesTwoThousandSevenTrancheCMember
Series 2007A Tranche D [Member]  
Fair Value Of Financial Instruments [Line Items]  
Fair Value of Senior Notes $ 40,777us-gaap_LongTermDebtFairValue
/ us-gaap_DebtInstrumentAxis
= exp_SeriesTwoThousandSevenTrancheDMember