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Fair Value of Senior Notes (Detail) $ in Thousands | Dec. 31, 2017 USD ($)
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Series 2007A Tranche D [Member] |
Fair Value Of Financial Instruments [Line Items] |
Fair Value of Senior Notes | $ 38,126
4.5% Senior Unsecured Notes Due 2026 [Member] |
Fair Value Of Financial Instruments [Line Items] |
Fair Value of Senior Notes | $ 365,190

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- Definition Fair value of financial instruments. + References No definition available. + Details
Name: | exp_FairValueOfFinancialInstrumentsLineItems
Namespace Prefix: | exp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
Name: | us-gaap_LongTermDebtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_DebtInstrumentAxis=exp_SeriesTwoThousandSevenTrancheDMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=exp_FourPointFivePercentageSeniorUnsecuredNotesDueTwoThousandTwentySixMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |