TRANSACTIONS WITH AFFILIATES (Details) (Reinsurance [Member], Affiliated Entity [Member])	3 Months Ended	12 Months Ended
Mar. 31, 2014	Dec. 31, 2012
Reinsurance [Member] \| Affiliated Entity [Member]
Related Party Transaction [Line Items]
Percentage cost of protection to assumed reinsurance premiums written (in hundredths)	8.00%	9.00%

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