Name:	thr_GuaranteeObligationsCashDepositsPledgedAsCollateral
Namespace Prefix:	thr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Represents the amount of guarantee obligations represented by a reduction of the available amount of the entity's revolving lines of credit.

No definition available.

Name:	thr_GuaranteeObligationsRepresentedByReductionOfAvailableAmountOfLinesOfCredit
Namespace Prefix:	thr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Represents the amount of guarantee obligations secured by cash deposits.

No definition available.

Name:	thr_GuaranteeObligationsSecuredByCashDeposits
Namespace Prefix:	thr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Represents the tax due that is requested by the revenue agency.

No definition available.

Name:	thr_LossContingencyTaxDueRequestedByRevenueAgency
Namespace Prefix:	thr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Interpretation (FIN)

-Number 45

-Paragraph 13

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph (b)(1)

-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248