Name:	emci_AffiliatedReinsuranceContractFirstLayerCoinsuranceRate
Namespace Prefix:	emci_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The Company's limit specified for the first layer in a ceded reinsurance contract between the Company and an affiliate.

No definition available.

Name:	emci_AffiliatedReinsuranceContractFirstLayerLimit
Namespace Prefix:	emci_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The Company's retention amount specified in a ceded reinsurance contract between the Company and an affiliate.

No definition available.

Name:	emci_AffiliatedReinsuranceContractRetention
Namespace Prefix:	emci_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The Company's coinsurance percentage specified for the second layer in a ceded reinsurance contract between the Company and an affiliate.

No definition available.

Name:	emci_AffiliatedReinsuranceContractSecondLayerCoinsuranceRate
Namespace Prefix:	emci_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The Company's limit specified for the second layer in a ceded reinsurance contract between the Company and an affiliate.

No definition available.

Name:	emci_AffiliatedReinsuranceContractSecondLayerLimit
Namespace Prefix:	emci_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Represents losses and settlement expenses assumed.

No definition available.

Name:	emci_AssumedLossesAndSettlementExpensesIncurred
Namespace Prefix:	emci_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Represents earned premium assumed from EMC through the quota share agreement.

No definition available.

Name:	emci_AssumedQuotaShareEarnedPremium
Namespace Prefix:	emci_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Refers to the amount a catastrophe event must be greater than to be subject to the terms of the treaty.

No definition available.

Name:	emci_CatastropheEventMinimumAmount
Namespace Prefix:	emci_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

Refers to amount of commissions paid by the reinsurance subsidiary to Employers Mutual.

No definition available.

Name:	emci_CommissionsPaidByReinsuranceSubsidiary
Namespace Prefix:	emci_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Amount settled upon in a reinsurance commutation agreement.

No definition available.

Name:	emci_CommutationSettlementAmount
Namespace Prefix:	emci_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

Refers to cost allocation to the Company not through the pooling agreement.

No definition available.

Name:	emci_CostAllocationByParentToSubsidiaryNotInPoolingAgreement
Namespace Prefix:	emci_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Refers to cost allocation to the Company through the pooling agreement.

No definition available.

Name:	emci_CostAllocationToSubsidiaryFromPoolingAgreement
Namespace Prefix:	emci_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Refers to amount of investment expenses allocated to the company by Employers Mutual.

No definition available.

Name:	emci_InvestmentExpensesAllocatedToCompany
Namespace Prefix:	emci_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Refers to number of reinsurance treaties in the reinsurance program between the business segment and the Company's parent.

No definition available.

Name:	emci_NumberOfReinsuranceProgramTreaties
Namespace Prefix:	emci_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Refers to percentage of cost of protection to total assumed reinsurance premiums written under an affiliated ceded reinsurance contract.

No definition available.

Name:	emci_PercentageAsCostOfProtectionToAssumedReinsurancePremiumsWrittenAffiliated
Namespace Prefix:	emci_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Refers to percentage of pool participation for the property and casualty insurance subsidiaries.

No definition available.

Name:	emci_PercentageOfPoolParticipation
Namespace Prefix:	emci_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Refers to the percentage applied to business assumed by the reinsurance subsidiary through the quota share agreement.

No definition available.

Name:	emci_QuotaSharePercentage
Namespace Prefix:	emci_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Amount of earned premiums ceded to other entities.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.1)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 944
-SubTopic 605
-Section 50
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 235
-Section S99
-Paragraph 2
-Subparagraph (SX 210.12-17)
-URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915

Name:	us-gaap_CededPremiumsEarned
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=64836518&loc=d3e30700-110894

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=64836518&loc=d3e30690-110894

Name:	us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Amount of reduction of provision for policy benefits and costs incurred for policies ceded.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 20
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6480758&loc=d3e6811-158387

Name:	us-gaap_ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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

Name:	us-gaap_StatementBusinessSegmentsAxis=us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_StatementBusinessSegmentsAxis=emci_ReinsuranceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_ConsolidatedEntitiesAxis=us-gaap_AffiliatedEntityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	emci_ReinsuranceTreatiesAxis=emci_AnnualAggregateCatastropheExcessofLossMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: