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Liquidating Distributions - Additional Information (Detail) $ in Millions	Sep. 30, 2017 USD ($)
Equity [Abstract]
Cash distributions payable	$ 8.8

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- Definition

Liquidating distribution obligation in cash.

+ References

No definition available.

+ Details

Name:	mtlqq_LiquidatingDistributionObligationInCash
Namespace Prefix:	mtlqq_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

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