Annual report pursuant to Section 13 and 15(d)

Income Taxes (Details)

v2.4.1.9
Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Tax Credit Carryforward [Line Items]      
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount $ 16,094us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount    
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate    
Alternative Minimum Tax Credit Carryforwards 426mtii_AlternativeMinimumTaxCreditCarryforwards    
Operating Loss Carryforwards, Limitation as Per IRC 129,521mtii_OperatingLossCarryforwardsLimitationAsPerIRC    
Change in valuation allowance affecting tax expense 9,322us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 1,760us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 5,538us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Increase (Decrease) in Deferred Tax Assets Valuation Allowance Related to Changes in Derivative Fair Values 1,708mtii_IncreaseDecreaseInDeferredTaxAssetsValuationAllowanceRelatedToChangesInDerivativeFairValues    
Increase (Decrease) in Other Adjustments in Deferred Tax Assets Valuation Allowance 5,064mtii_IncreaseDecreaseInOtherAdjustmentsInDeferredTaxAssetsValuationAllowance    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 65us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued    
Internal Revenue Service (IRS)      
Tax Credit Carryforward [Line Items]      
Operating Loss Carryforwards 371,847us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember
   
State and Local Jurisdiction      
Tax Credit Carryforward [Line Items]      
Operating Loss Carryforwards 117,378us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
   
Tax Credit Carryforward, Amount $ 1,040us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember