Factoring of Accounts Receivable (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
Jun. 30, 2013	Dec. 31, 2012
Factoring of Accounts Receivable [Abstract]
Accounts receivable sold without recourse	$ 4.9	$ 0

The value of receivables sold at a discount to unrelated third party financiers without recourse.

No definition available.

Name:	feic_AccountsReceivableSoldWithoutRecourse
Namespace Prefix:	feic_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration