Name:	emci_BasisPointsAddedOverFairValueInputDiscountRate
Namespace Prefix:	emci_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Refers to the current interest rate on surplus notes.

No definition available.

Name:	emci_CurrentInterestRateOnSurplusNotes
Namespace Prefix:	emci_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Represents number of equity securities that are reported as level-3 fair value measurement.

No definition available.

Name:	emci_NumberOfEquitySecurities
Namespace Prefix:	emci_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

Represents number of fixed maturity securities that are reported as level-3 fair value measurement.

No definition available.

Name:	emci_NumberOfFixedMaturitySecurities
Namespace Prefix:	emci_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

Refers to number of fixed maturity securities not priced by independent pricing service.

No definition available.

Name:	emci_NumberOfFixedMaturitySecuritiesNotPricedByIndependentPricingService
Namespace Prefix:	emci_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

Refers to the period after which rate is adjusted.

No definition available.

Name:	emci_PeriodAfterWhichRateIsAdjusted
Namespace Prefix:	emci_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Refers to period for surplus notes included in assumptions.

No definition available.

Name:	emci_PeriodForSurplusNotesIncludedInAssumptions
Namespace Prefix:	emci_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

No definition available.

Name:	emci_ShortTermInvestmentsFairValueDisclosure
Namespace Prefix:	emci_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

This element represents a certain statement of financial position liability caption which represents a class of financial instruments issued by insurance entities (surplus notes) that are includable in surplus for statutory accounting purposes as prescribed or permitted by state laws and regulations that are liabilities of the issuer carried at cost but measured at fair value for this disclosure.

No definition available.

Name:	emci_SurplusNotesFairValueDisclosure
Namespace Prefix:	emci_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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

This element represents the portion of the balance sheet assertion valued at fair value by the entity 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. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 12

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Available-for-Sale Securities

-URI http://asc.fasb.org/extlink&oid=6505594

Name:	us-gaap_AvailableForSaleSecuritiesFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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

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