Guarantor Financial Statements (Unaudited) (Details) (FM O&G LLC Guarantor [Member])	Mar. 31, 2015
FM O&G LLC Guarantor [Member]
Debt Instrument [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent	100.00%

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

No definition available.

Name:	us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant