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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Accounting Policies [Abstract]
Unamortized debt issuance costs	$ 3,961	$ 4,178

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- Definition

Unamortized discounts and debt issuance costs.

+ References

No definition available.

+ Details

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Namespace Prefix:	idi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration