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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, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Employee Benefit Plans [Line Items] |  |  |
Calculation of payroll costs | 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] |  |  |
Calculation of payroll costs | 22.00% |  |
Amounts contributed for employee benefits | $ 119 | $ 196 | $ 194
Provident Fund [Member] |  |  |
Employee Benefit Plans [Line Items] |  |  |
Calculation of payroll costs | 5.00% |  |
Amounts contributed for employee benefits | 6 | 6 | 6
Medical Insurance Benefits [Member] |  |  |
Employee Benefit Plans [Line Items] |  |  |
Amounts contributed for employee benefits | 65 | 106 | 106
Housing Funds [Member] |  |  |
Employee Benefit Plans [Line Items] |  |  |
Amounts contributed for employee benefits | 38 | 62 | 62
Other Benefits [Member] |  |  |
Employee Benefit Plans [Line Items] |  |  |
Amounts contributed for employee benefits | $ 16 | $ 27 | $ 26

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- Definition Defined Benefit Plan Target Allocation Percentage Total + References No definition available. + Details
Name: | idi_DefinedBenefitPlanTargetAllocationPercentageTotal
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 Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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=21915506&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