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Related party transactions (Details) (Affiliated Entity [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Affiliated Entity [Member]
Related Party Transaction [Line Items]
Purchases of inventory and services	$ 5.6	$ 5.1	$ 4.8
Proceeds from sale of equipment and services	$ 1.1	$ 1.1	$ 4.0

X

- Definition

Related Party Transaction, Proceeds from Sale of Inventory and Services with Related Party

+ References

No definition available.

+ Details

Name:	fet_RelatedPartyTransactionProceedsFromSaleOfInventoryAndServicesWithRelatedParty
Namespace Prefix:	fet_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Related Party Transaction, Purchases of Inventory and Services with Related Party

+ References

No definition available.

+ Details

Name:	fet_RelatedPartyTransactionPurchasesOfInventoryAndServicesWithRelatedParty
Namespace Prefix:	fet_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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