Consolidated Statements of Stockholders' Equity (Parenthetical) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Stockholders' Equity [Abstract]
Accrued compensation expense	$ 0.0	$ 1.9	$ 9.1

Adjustments to additional paid in capital accrued share-based compensation requisite service period recognition value.

No definition available.

Name:	ttgt_AdjustmentsToAdditionalPaidInCapitalAccruedShareBasedCompensationRequisiteServicePeriodRecognitionValue
Namespace Prefix:	ttgt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration