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Commitments and Contingencies - Additional Information (Detail) - USD ($) | Jun. 30, 2015 | Dec. 31, 2014
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Commitments and Contingencies Disclosure [Abstract] |  |
Material capital commitment under non-cancellable data licensing | $ 371,000 |
Provision for operational claims | $ 0 | $ 0

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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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- 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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- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration