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Quarterly report pursuant to Section 13 or 15(d)

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- Document and Entity Information
Financial Statements
Notes to Financial Statements
Accounting Policies
- Recent Accounting Pronouncements (Policies)
Notes Tables
Notes Details
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- Uncategorized Items - mtii-20190331.xml

Derivatives - Summary of Outstanding Swaps (Details)

v3.19.1

Derivatives - Summary of Outstanding Swaps (Details) - USD ($)		3 Months Ended
	Apr. 30, 2019	Mar. 31, 2019
Subsequent Event
Derivatives
Termination amount	$ 8,767,000
Counterparty \| Subsequent Event
Derivatives
Termination amount	$ 6,540,000
3.110% interest rate swaps
Derivatives
Notional		$ 189,013,883
Fixed Rate Paid		3.11%
Variable interest rate base		3 mo.USD-LIBOR-BBA
3.110% interest rate swaps \| Base Rate
Derivatives
Variable interest rate base floor		1.00%
3.110% interest rate swaps
Derivatives
Notional		$ 246,875,000
Fixed Rate Paid		3.11%
Variable interest rate base		3 mo.USD-LIBOR-BBA
3.110% interest rate swaps \| Base Rate
Derivatives
Variable interest rate base floor		1.00%
2.504% interest rate swaps
Derivatives
Notional		$ 49,375,000
Fixed Rate Paid		2.504%
Variable interest rate base		3 mo.USD-LIBOR-BBA
2.504% interest rate swaps \| Base Rate
Derivatives
Variable interest rate base floor		1.00%
1.833% interest rate swaps
Derivatives
Notional		$ 372,287,500
Fixed Rate Paid		1.833%
Variable interest rate base		3 mo.USD-LIBOR-BBA
1.833% interest rate swaps \| Base Rate
Derivatives
Variable interest rate base floor		1.00%

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

Name:	invest_DerivativeNotionalAmount
Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

When the derivative or group of derivatives presented is a swap, the type of interest rate (fixed, variable, stepped, etc.) paid on the swap.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column A
-Footnote 1

+ Details

Name:	invest_DerivativeTypeOfInterestRatePaidOnSwap
Namespace Prefix:	invest_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount Paid On Contract Termination

+ References

No definition available.

+ Details

Name:	mtii_AmountPaidOnContractTermination
Namespace Prefix:	mtii_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Average fixed interest rate that will be received or paid upon exercise of a group of interest rate swaption contracts.

+ References

No definition available.

+ Details

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

- Definition

The percentage points added to the reference rate to compute the variable rate on the interest rate derivative.

+ References

No definition available.

+ Details

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

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=mtii_CounterpartyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=mtii_InterestRateSwapRatePaid3.110PercentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=mtii_InterestRateSwapRatePaid3.110PercentTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=mtii_InterestRateSwapRatePaid2.504PercentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=mtii_InterestRateSwapRatePaid1.833PercentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: