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

X

- 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

X

- Details

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

X

- 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

X

- 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: