Retirement Plans (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Retirement Plans
Minimum percentage of annual eligible compensation by the participants	1.00%
Maximum percentage of annual eligible compensation by the participants	90.00%
Percentage of contribution matched	5.00%
Percentage of contribution, matched 100% by employer	3.00%
Employer match of employee contributions of first 3% of contributions	100.00%
Percentage of contribution, matched 50% by employer	2.00%
Employer match of employee contributions of next 3% of contributions	50.00%
Contribution expenses	$ 0.9	$ 0.7	$ 0.7

Represents the employer matching contribution of the second level of employee contributions.

No definition available.

Name:	th_DefinedContributionPlanEmployerMatchPercentLevelTwo
Namespace Prefix:	th_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the first level of employee contributions which are matched by the employer.

+ References

No definition available.

+ Details

Name:	th_DefinedContributionPlanEmployerMatchingContributionPercentLevelOne
Namespace Prefix:	th_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the second level of employee contributions which are matched by the employer

+ References

No definition available.

+ Details

Name:	th_DefinedContributionPlanEmployerMatchingContributionPercentLevelTwo
Namespace Prefix:	th_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Minimum percentage of employee gross pay the employee may contribute to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	th_DefinedContributionPlanMinimumAnnualContributionsPerEmployeePercent
Namespace Prefix:	th_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

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

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

+ Details

Name:	us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage employer matches of the employee's percentage contribution matched.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration