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Commitments and Contingencies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014
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Commitments and Contingencies Disclosure [Abstract] |
Material capital commitment under non-cancellable advertising equipment construction contracts | $ 142 idi_CapitalCommitments

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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

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