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Commitments and Contingencies - Additional Information (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Material capital commitment under non-cancellable advertising equipment construction contracts	$ 662,000idi_CapitalCommitments
Provision for operational claims	$ 0idi_ProvisionsForOperationalClaims	$ 0idi_ProvisionsForOperationalClaims

X

- Definition

Capital commitments.

+ References

No definition available.

+ Details

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Namespace Prefix:	idi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Provisions for operational claims.

+ References

No definition available.

+ Details

Name:	idi_ProvisionsForOperationalClaims
Namespace Prefix:	idi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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