LEASED MINERAL RIGHTS (Details) (Mountaineer, USD $) In Millions, unless otherwise specified	1 Months Ended
Nov. 30, 2011	May 31, 2011 item
Mountaineer
Leased mineral rights
Area for leasing mineral rights under lease agreement (in acres)		1,707
Initial lease term under lease agreement		5 years
Additional extended lease term under lease agreement		5 years
Lease bonus payment required by agreement (in dollars per acre)		1,265
Aggregate lease bonus payment required by agreement		$ 2.1
Percentage of royalty on the sale of any oil or gas retrieved by lessee		14.00%
Amount of lease bonus payment received	$ 0.3	$ 1.8

Represents the additional extended lease term of the lease agreement.

No definition available.

Name:	mntg_LeaseAgreementAdditionalExtendedLeaseTerm
Namespace Prefix:	mntg_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Represents the area for leasing mineral rights under the lease agreement.

No definition available.

Name:	mntg_LeaseAgreementAreaForLeasingMineralRight
Namespace Prefix:	mntg_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	duration

Represents the initial lease term of the lease agreement.

No definition available.

Name:	mntg_LeaseAgreementInitialLeaseTerm
Namespace Prefix:	mntg_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Represents the aggregate bonus payment required to be paid to entity under the lease agreement.

No definition available.

Name:	mntg_LeaseAgreementLeaseAggregateBonusPaymentRequired
Namespace Prefix:	mntg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Represents the lease bonus payment received by the entity during the period.

No definition available.

Name:	mntg_LeaseAgreementLeaseBonusPaymentReceived
Namespace Prefix:	mntg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Represents the bonus payment per acre required to be paid to entity under the lease agreement.

No definition available.

Name:	mntg_LeaseAgreementLeaseBonusPaymentRequiredPerAcre
Namespace Prefix:	mntg_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

Represents the percentage of royalty on the sale of any oil or gas retrieved by the lessee.

No definition available.

Name:	mntg_RoyaltyRevenuePercentageOnSaleOfOilOrGas
Namespace Prefix:	mntg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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