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Employee Benefit Plans - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Employee Benefit Plans [Line Items]
Employer contribution		5.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Minimum [Member]
Employee Benefit Plans [Line Items]
Range of other statutory benefits	1.00%idi_DefinedBenefitsPlanTargetAllocationPercentage / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum [Member]
Employee Benefit Plans [Line Items]
Range of other statutory benefits	10.00%idi_DefinedBenefitsPlanTargetAllocationPercentage / us-gaap_RangeAxis = us-gaap_MaximumMember
Provident Fund [Member]
Employee Benefit Plans [Line Items]
Employer contribution	5.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = idi_ProvidentFundMember
Contribution for employee benefits	$ 2us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = idi_ProvidentFundMember	$ 2us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = idi_ProvidentFundMember
Medical Insurance Benefits [Member]
Employee Benefit Plans [Line Items]
Contribution for employee benefits	35us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = idi_MedicalInsuranceMember	168us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = idi_MedicalInsuranceMember
Housing Funds [Member]
Employee Benefit Plans [Line Items]
Contribution for employee benefits	22us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = idi_HousingFundsMember	98us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = idi_HousingFundsMember
Other Benefits [Member]
Employee Benefit Plans [Line Items]
Contribution for employee benefits	15us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = idi_OtherBenefitsMember	42us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = idi_OtherBenefitsMember
Pension Plan [Member]
Employee Benefit Plans [Line Items]
Employer contribution	21.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember	22.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember
Contribution for employee benefits	$ 67us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember	$ 308us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember

X

- Definition

Defined benefit plan target allocation percentage total.

+ References

No definition available.

+ Details

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Namespace Prefix:	idi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:	idi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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=35743120&loc=d3e1928-114920

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

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X

- Details

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- Details

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X

- Details

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X

- Details

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- Details

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X

- Details

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X

- Details

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