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Subsequent Events - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013
Subsequent Events [Abstract] |
Material subsequent events | $ 0

X
- Definition Number other of material recognizable subsequent events. + References No definition available. + Details
Name: | idi_NumberOtherOfMaterialRecognizableSubsequentEvents
Namespace Prefix: | idi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_SubsequentEventsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration