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Pension and Employee Benefit Plans - Additional Information (Detail) $ in Millions	Dec. 31, 2017 USD ($)
Compensation And Retirement Disclosure [Abstract]
Contributions to pension plans	$ 8.5

X

- Definition

Defined benefit plan employer contributions current.

+ References

No definition available.

+ Details

Name:	exp_DefinedBenefitPlanEmployerContributionsCurrent
Namespace Prefix:	exp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration