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Employee Benefit Plans - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Employee Benefit Plans [Line Items] |  |  |
Employer contribution to the scheme | 5.00% |  |
Minimum [Member] |  |  |
Employee Benefit Plans [Line Items] |  |  |
Range of other statutory benefits | 1.00% |  |
Maximum [Member] |  |  |
Employee Benefit Plans [Line Items] |  |  |
Range of other statutory benefits | 10.00% |  |
Defined Contribution Pension [Member] |  |  |
Employee Benefit Plans [Line Items] |  |  |
Employer contribution to the scheme | 22.00% |  |
Amounts contributed for employee benefits | $ 308 | $ 119 | $ 196
Provident Fund [Member] |  |  |
Employee Benefit Plans [Line Items] |  |  |
Employer contribution to the scheme | 5.00% |  |
Amounts contributed for employee benefits | 2 | 6 | 6
Medical Insurance Benefits [Member] |  |  |
Employee Benefit Plans [Line Items] |  |  |
Amounts contributed for employee benefits | 168 | 65 | 106
Housing Funds [Member] |  |  |
Employee Benefit Plans [Line Items] |  |  |
Amounts contributed for employee benefits | 98 | 38 | 62
Other Benefits [Member] |  |  |
Employee Benefit Plans [Line Items] |  |  |
Amounts contributed for employee benefits | $ 42 | $ 16 | $ 27

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- Definition Defined benefit plan target allocation percentage total. + References No definition available. + Details
Name: | idi_DefinedBenefitsPlanTargetAllocationPercentage
Namespace Prefix: | idi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

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- Definition The increase in the fair value of plan assets from contributions made by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanContributionsByEmployer
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration