CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (Parenthetical) (USD $)	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
REVENUES
Premiums earned, affiliated	$ 119,117,085	$ 108,743,980
LOSSES AND EXPENSES
Losses and settlement expenses, affiliated	72,478,518	65,016,611
Amortization of deferred policy acquisition costs, affiliated	21,949,783	18,958,861
Other expense, affiliated	$ 87,072	$ 472,033

From affiliates, amount of deferred policy acquisition costs charged to expense in the period, generally in proportion to related revenue earned, estimated gross profits, or over the customer relationship or some other period.

No definition available.

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