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Statutory Reserve - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Regulated Operations [Abstract] |  |
Minimum percentage of profit after taxes required for appropriations to statutory reserve | 10.00%idi_MinimumPercentageOfProfitAfterTaxesRequiredForAppropriationsToStatutoryReserve |
Percentage of entity's registered capital reserve fund reached | 50.00%idi_PercentageOfEntitysRegisteredCapitalReserveFundReached |
Appropriations to the statutory reserve funds | $ 0 idi_AppropriationsToStatutoryReserves | $ 0 idi_AppropriationsToStatutoryReserves
Accumulated statutory reserve funds | $ 0 idi_AccumulatedAppropriationOfStatutoryReserves | $ 0 idi_AccumulatedAppropriationOfStatutoryReserves

X
- 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

X
- 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

X
- 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: | us-gaap_RegulatedOperationsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration