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Long-Term Deferred Expenses - Summary of Long-Term Deferred Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Deferred Expenses Non Current [Line Items]  
Deferred costs $ 580us-gaap_DeferredCosts
Rent Of Advertising Space [Member]  
Deferred Expenses Non Current [Line Items]  
Weighted average amortization period 5 years
Deferred costs 358us-gaap_DeferredCosts
/ us-gaap_NatureOfExpenseAxis
= idi_RentOfAdvertisingSpaceMember
Concession Approval Fees [Member]  
Deferred Expenses Non Current [Line Items]  
Weighted average amortization period 3 years
Deferred costs $ 222us-gaap_DeferredCosts
/ us-gaap_NatureOfExpenseAxis
= idi_ConcessionApprovalFeesMember