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Related Party Transactions and Balances - Summary of Related Party Transactions (Parenthetical) (Detail) (Chief Operating Officer [Member]) | 12 Months Ended
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Dec. 31, 2013 Lease_Agreement
Chief Operating Officer [Member] |
Related Party Transaction [Line Items] |
Common shares issued | 410,000 us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ChiefOperatingOfficerMember
Key lease agreements acquired | 8 idi_NumberOfLeaseAgreementsAcquired / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ChiefOperatingOfficerMember

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- Definition Number of Lease Agreements Acquired + References No definition available. + Details
Name: | idi_NumberOfLeaseAgreementsAcquired
Namespace Prefix: | idi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of shares of equity interests issued or issuable to acquire entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
Name: | us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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