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Commitments and Contingencies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Commitments And Contingent Liabilities [Line Items] |  |
Material capital commitment | $ 0 |
Provision for operational claims | $ 0 | $ 0

X
- 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
- Details
Name: | idi_CommitmentsAndContingentLiabilitiesLineItems
Namespace Prefix: | idi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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