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Commitments and Contingencies - Additional Information (Detail) (USD $) | Mar. 31, 2015 | Dec. 31, 2014
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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

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- Definition Capital commitments. + References No definition available. + Details
Name: | idi_CapitalCommitments
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

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