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Summary of Significant Accounting Policies - Estimated Useful Lives of Property and Equipment (Detail) | 3 Months Ended
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Mar. 31, 2015
Computer and Network Equipment [Member] | Minimum [Member] |
Property, Plant and Equipment [Line Items] |
Estimated life of property and equipment | 5 years
Computer and Network Equipment [Member] | Maximum [Member] |
Property, Plant and Equipment [Line Items] |
Estimated life of property and equipment | 7 years
Advertising Display Equipment [Member] |
Property, Plant and Equipment [Line Items] |
Estimated life of property and equipment | 5 years
Furniture, fixtures and office equipment [Member] | Minimum [Member] |
Property, Plant and Equipment [Line Items] |
Estimated life of property and equipment | 3 years
Furniture, fixtures and office equipment [Member] | Maximum [Member] |
Property, Plant and Equipment [Line Items] |
Estimated life of property and equipment | 5 years
Vehicles [Member] |
Property, Plant and Equipment [Line Items] |
Estimated life of property and equipment | 5 years

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

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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=idi_AdvertisingDisplayEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_ComputerEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_FurnitureAndFixturesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_VehiclesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |