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Subsequent Events - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	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