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Statutory reserve - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
Statutory Reserve [Line Items] |  |
Minimum percentage of profit after taxes required for appropriations to statutory reserve |  | 10.00%
Percentage of entity's registered capital reserve fund reached |  | 50.00%
Appropriations to the statutory reserve funds | $ 0 | $ 0
Accumulated statutory reserve funds | $ 162 | $ 162

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- Definition Accumulated Appropriation Of Statutory Reserves + References No definition available. + Details
Name: | idi_AccumulatedAppropriationOfStatutoryReserves
Namespace Prefix: | idi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Appropriations To Statutory Reserves + References No definition available. + Details
Name: | idi_AppropriationsToStatutoryReserves
Namespace Prefix: | idi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Minimum Percentage Of Profit After Taxes Required For Appropriations To Statutory Reserve + References No definition available. + Details
Name: | idi_MinimumPercentageOfProfitAfterTaxesRequiredForAppropriationsToStatutoryReserve
Namespace Prefix: | idi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of entity's registered capital reserve fund reached + References No definition available. + Details
Name: | idi_PercentageOfEntitysRegisteredCapitalReserveFundReached
Namespace Prefix: | idi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | idi_StatutoryReserveLineItems
Namespace Prefix: | idi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration