Quarterly report pursuant to Section 13 or 15(d)

LiveWatch Acquisition - Narrative (Details)

v2.4.1.9
LiveWatch Acquisition - Narrative (Details) (USD $)
0 Months Ended 3 Months Ended
Feb. 23, 2015
Mar. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]      
Goodwill   $ 563,011,000us-gaap_Goodwill $ 527,502,000us-gaap_Goodwill
LiveWatch Security, LLC      
Business Acquisition [Line Items]      
Fair value of consideration 61,115,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= mtii_LiveWatchSecurityLLCMember
   
Cash paid for acquisition 3,988,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= mtii_LiveWatchSecurityLLCMember
   
Contingent consideration recognized in earnings   519,000mtii_BusinessCombinationContingentConsiderationCostsRecognizedinEarnings
/ us-gaap_BusinessAcquisitionAxis
= mtii_LiveWatchSecurityLLCMember
 
Goodwill 35,509,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= mtii_LiveWatchSecurityLLCMember
   
Amortization rate of acquired intangible assets 235.00%mtii_AcquiredFiniteLivedIntangibleAssetAmortizationRate
/ us-gaap_BusinessAcquisitionAxis
= mtii_LiveWatchSecurityLLCMember
   
Acquisition related costs   946,000us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= mtii_LiveWatchSecurityLLCMember
 
LiveWatch Security, LLC | Subscriber accounts      
Business Acquisition [Line Items]      
Useful life of acquired intangible assets 14 years    
LiveWatch Security, LLC | Other intangible asset      
Business Acquisition [Line Items]      
Useful life of acquired intangible assets 10 years    
LiveWatch Security, LLC | Management retention bonus      
Business Acquisition [Line Items]      
Contingent consideration liability 6,000,000us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
/ us-gaap_BusinessAcquisitionAxis
= mtii_LiveWatchSecurityLLCMember
/ us-gaap_ContingentConsiderationByTypeAxis
= mtii_BusinessCombinationManagementRetentionMember
   
Term of contingent consideration 2 years    
LiveWatch Security, LLC | Performance bonus      
Business Acquisition [Line Items]      
Contingent consideration liability   $ 8,500,000us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
/ us-gaap_BusinessAcquisitionAxis
= mtii_LiveWatchSecurityLLCMember
/ us-gaap_ContingentConsiderationByTypeAxis
= mtii_BusinessCombinationPerformanceBonusMember
 
Term of contingent consideration 4 years