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Related Party Transactions and Balances - Summary of Related Party Transactions (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Advertising [Member] |  |
Related Party Transaction [Line Items] |  |
Costs of leases of advertising spaces | $ 375 idi_RelatedPartyTransactionRentExpensesForLease / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = idi_AdvertisingMember | $ 166 idi_RelatedPartyTransactionRentExpensesForLease / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = idi_AdvertisingMember
Chief Operating Officer [Member] | Lease Agreements [Member] |  |
Related Party Transaction [Line Items] |  |
Purchase of lease agreements |  | $ 2,200 us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeaseAgreementsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ChiefOperatingOfficerMember

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- Definition Related party transaction rent expenses for lease. + References No definition available. + Details
Name: | idi_RelatedPartyTransactionRentExpensesForLease
Namespace Prefix: | idi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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

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- Definition Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=idi_AdvertisingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_ChiefOperatingOfficerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |