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Principal Activities and Organization - Additional Information (Detail) | 12 Months Ended | 0 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2014 Subsidiaries | Nov. 30, 2012 | Dec. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 Subsidiaries
Organization And Principal Business [Line Items] |  |  |  |  |
Effective date of merger | Mar. 21, 2015 |  |  |  |
Establishment date of subsidiary | Dec. 11, 2014 |  |  |  |
Merger agreement date | Dec. 14, 2014 |  |  |  |
Number of subsidiaries | 3 idi_NumberOfSubsidiaries |  |  |  |
Shanghai Tiger Shangda [Member] |  |  |  |  |
Organization And Principal Business [Line Items] |  |  |  |  |
Equity interests |  | 100.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions / dei_LegalEntityAxis = idi_ShanghaiTigerShangdaMember |  |  |
Zhejiang Continental [Member] |  |  |  |  |
Organization And Principal Business [Line Items] |  |  |  |  |
Equity interests |  |  | 100.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions / dei_LegalEntityAxis = idi_ZhejiangContinentalAdvertisingCompanyLimitedMember |  |
HK Ad-Icon [Member] |  |  |  |  |
Organization And Principal Business [Line Items] |  |  |  |  |
Equity interests |  |  |  | 100.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions / dei_LegalEntityAxis = idi_AdIconCompanyLimitedMember |
Jingli [Member] |  |  |  |  |
Organization And Principal Business [Line Items] |  |  |  |  |
Number of subsidiaries |  |  |  | 5 idi_NumberOfSubsidiaries / dei_LegalEntityAxis = idi_ShanghaiJingliAdvertisingCompanyLimitedMember | 5 idi_NumberOfSubsidiaries / dei_LegalEntityAxis = idi_ShanghaiJingliAdvertisingCompanyLimitedMember
Best One Inc [Member] |  |  |  |  |
Organization And Principal Business [Line Items] |  |  |  |  |
Equity interests | 100.00%us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions / dei_LegalEntityAxis = idi_BestOneIncMember |  |  |  |

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