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Nonmonetary Transactions - Additional Information (Detail) | 12 Months Ended |  | 12 Months Ended | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2014 Advertising Barter Transaction One [Member] USD ($) | Dec. 31, 2013 Advertising Barter Transaction One [Member] USD ($) Sheet | Dec. 31, 2013 Advertising Barter Transaction One [Member] | Aug. 31, 2013 Advertising Barter Transaction Two [Member] USD ($) | Dec. 31, 2014 Advertising Barter Transaction Two [Member] USD ($) | Dec. 31, 2013 Advertising Barter Transaction Two [Member] USD ($) | Dec. 31, 2014 Advertising Barter Transaction Three [Member] USD ($) | Dec. 31, 2013 Advertising Barter Transaction Three [Member] USD ($)
Nonmonetary Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Advertising issuance revenue on barter transactions | $ 175,000 us-gaap_AdvertisingBarterTransactionsAdvertisingBarterRevenue |  |  |  |  |  |  |  |  |
Barter credits received | 186,000 us-gaap_AdvertisingBarterTransactionsAdvertisingBarterCosts |  |  |  |  |  |  |  |  |
Gain or loss on barter transactions | 0 us-gaap_NonmonetaryTransactionAmountOfBarterTransaction |  | 534,000 us-gaap_NonmonetaryTransactionAmountOfBarterTransaction / us-gaap_NonmonetaryTransactionTypeAxis = idi_AdvertisingBarterTransactionOneMember | 0 us-gaap_NonmonetaryTransactionAmountOfBarterTransaction / us-gaap_NonmonetaryTransactionTypeAxis = idi_AdvertisingBarterTransactionOneMember |  | 492,000 us-gaap_NonmonetaryTransactionAmountOfBarterTransaction / us-gaap_NonmonetaryTransactionTypeAxis = idi_AdvertisingBarterTransactionTwoMember |  | 0 us-gaap_NonmonetaryTransactionAmountOfBarterTransaction / us-gaap_NonmonetaryTransactionTypeAxis = idi_AdvertisingBarterTransactionTwoMember | 492,000 us-gaap_NonmonetaryTransactionAmountOfBarterTransaction / us-gaap_NonmonetaryTransactionTypeAxis = idi_AdvertisingBarterTransactionThreeMember | 0 us-gaap_NonmonetaryTransactionAmountOfBarterTransaction / us-gaap_NonmonetaryTransactionTypeAxis = idi_AdvertisingBarterTransactionThreeMember
Nonmonetary transaction, agreement period |  |  |  | 2 months | 2 months | 3 years |  |  |  | 2 months
Number of sheets of coupons for spring and summer shoes |  |  |  | 1,077 idi_BarterCreditsNumberOfCouponSheetsForSpringAndSummerShoes / us-gaap_NonmonetaryTransactionTypeAxis = idi_AdvertisingBarterTransactionOneMember | 1,077 idi_BarterCreditsNumberOfCouponSheetsForSpringAndSummerShoes / us-gaap_NonmonetaryTransactionTypeAxis = idi_AdvertisingBarterTransactionOneMember |  |  |  |  |
Average market unit price of Spring & Summer shoes |  |  |  | 2,150 idi_SpringAndSummerShoesAverageUnitPrice / us-gaap_NonmonetaryTransactionTypeAxis = idi_AdvertisingBarterTransactionOneMember | 2,150 idi_SpringAndSummerShoesAverageUnitPrice / us-gaap_NonmonetaryTransactionTypeAxis = idi_AdvertisingBarterTransactionOneMember |  |  |  |  |
Number of sheets of coupons for Autumn & Winter shoes |  |  |  | 375 idi_BarterCreditsNumberOfCouponSheetsForAutumnAndWinterShoes / us-gaap_NonmonetaryTransactionTypeAxis = idi_AdvertisingBarterTransactionOneMember | 375 idi_BarterCreditsNumberOfCouponSheetsForAutumnAndWinterShoes / us-gaap_NonmonetaryTransactionTypeAxis = idi_AdvertisingBarterTransactionOneMember |  |  |  |  |
Average market unit price of Autumn & Winter shoes |  |  |  | 2,650 idi_AutumnAndWinterShoesAverageUnitPrice / us-gaap_NonmonetaryTransactionTypeAxis = idi_AdvertisingBarterTransactionOneMember | 2,650 idi_AutumnAndWinterShoesAverageUnitPrice / us-gaap_NonmonetaryTransactionTypeAxis = idi_AdvertisingBarterTransactionOneMember |  |  |  |  |
Nonmonetary transaction revenue recognized |  |  |  | 504,000 us-gaap_NonmonetaryTransactionGrossOperatingRevenueRecognized / us-gaap_NonmonetaryTransactionTypeAxis = idi_AdvertisingBarterTransactionOneMember |  |  |  |  |  | 457,000 us-gaap_NonmonetaryTransactionGrossOperatingRevenueRecognized / us-gaap_NonmonetaryTransactionTypeAxis = idi_AdvertisingBarterTransactionThreeMember
Capitalized barter credits |  |  |  | 542,000 us-gaap_DeferredRevenue / us-gaap_NonmonetaryTransactionTypeAxis = idi_AdvertisingBarterTransactionOneMember |  |  |  |  |  |
Nonmonetary transaction, gain (loss) recognized on transfer |  |  | 0 us-gaap_NonmonetaryTransactionGainLossRecognizedOnTransfer / us-gaap_NonmonetaryTransactionTypeAxis = idi_AdvertisingBarterTransactionOneMember |  |  |  |  | 0 us-gaap_NonmonetaryTransactionGainLossRecognizedOnTransfer / us-gaap_NonmonetaryTransactionTypeAxis = idi_AdvertisingBarterTransactionTwoMember | 0 us-gaap_NonmonetaryTransactionGainLossRecognizedOnTransfer / us-gaap_NonmonetaryTransactionTypeAxis = idi_AdvertisingBarterTransactionThreeMember |
Nonmonetary transaction description |  |  |  | The Company entered into an advertising agreement with a shoe manufacturing enterprise to release the advertisement of its products in 42 LCD screens for two months with the frequency of 120 times a day. | The Company entered into an advertising agreement with a shoe manufacturing enterprise to release the advertisement of its products in 42 LCD screens for two months with the frequency of 120 times a day. |  |  | In August 2013, the Company appointed a local communication company (the "Communication Company") for the approval service of an additional 54 LCD advertising locations concession |  | The Company entered into an agreement to release the advertisement in 99 LCD screens in 20 malls for two months with the frequency of 360 times a day
Cost of approval service |  |  |  |  |  | 492,000 idi_NonmonetaryTransactionCostOfService / us-gaap_NonmonetaryTransactionTypeAxis = idi_AdvertisingBarterTransactionTwoMember |  |  |  |
Capitalized approval costs |  |  |  |  |  | 492,000 idi_NonmonetaryTransactionCapitalizedCostOfService / us-gaap_NonmonetaryTransactionTypeAxis = idi_AdvertisingBarterTransactionTwoMember |  |  |  |
Capitalized approval costs, amortization period |  |  |  |  |  |  |  | 4 months |  |
Capitalized approval costs, amortized to cost of sales |  |  |  |  |  |  | 169,000 idi_NonmonetaryTransactionCapitalizedCostsCostAmortizedToCostOfRevenue / us-gaap_NonmonetaryTransactionTypeAxis = idi_AdvertisingBarterTransactionTwoMember | 58,000 idi_NonmonetaryTransactionCapitalizedCostsCostAmortizedToCostOfRevenue / us-gaap_NonmonetaryTransactionTypeAxis = idi_AdvertisingBarterTransactionTwoMember | 98,000 idi_NonmonetaryTransactionCapitalizedCostsCostAmortizedToCostOfRevenue / us-gaap_NonmonetaryTransactionTypeAxis = idi_AdvertisingBarterTransactionThreeMember |
Prepaid concession approval fees |  | 6,000 idi_PrepaidConcessionApprovalFees |  |  |  |  | 265,000 idi_PrepaidConcessionApprovalFees / us-gaap_NonmonetaryTransactionTypeAxis = idi_AdvertisingBarterTransactionTwoMember | 434,000 idi_PrepaidConcessionApprovalFees / us-gaap_NonmonetaryTransactionTypeAxis = idi_AdvertisingBarterTransactionTwoMember |  |
Period of right to use LED advertising screen |  |  |  |  |  |  |  |  | 5 years |
Amortized period of right to use LED advertising screen |  |  |  |  |  |  |  |  |  | 1 month
LED use right amortized to cost of sales |  |  |  |  |  |  |  |  |  | 8,000 idi_NonmonetaryTransactionConsiderationLedUseRightAmortizedToCostOfRevenue / us-gaap_NonmonetaryTransactionTypeAxis = idi_AdvertisingBarterTransactionThreeMember
Cost of revenue, outstanding |  |  |  |  |  |  |  |  | $ 386,000 idi_NonmonetaryTransactionCapitalizedCostsCostAmortizedToCostOfSales / us-gaap_NonmonetaryTransactionTypeAxis = idi_AdvertisingBarterTransactionThreeMember | $ 484,000 idi_NonmonetaryTransactionCapitalizedCostsCostAmortizedToCostOfSales / us-gaap_NonmonetaryTransactionTypeAxis = idi_AdvertisingBarterTransactionThreeMember

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