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Pension Plans - Multi-employer (Details) - Pension Plan [Member] - USD ($) $ in Thousands | 1 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2012 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Pension Plans |  |  |  |  |  |
Insolvent period |  | 20 years |  |  |  |
Estimated liability upon withdrawal from plan |  |  |  | $ 99,800 | $ 81,600 | $ 82,200
Percentage of annual compounded surcharge for rehabilitation |  | 5.00% |  |  |  |
Percentage of interim surcharge | 5.00% |  |  |  |  |
Pension expense |  | $ 2,226 | $ 2,307 | 2,961 | 2,836 |
Surcharges |  | $ 785 | $ 738 | $ 948 | $ 811 |

X
- Definition The portion of the entity's pension expense for the multiemployer plan that represents an increase in the surcharge, during the period. + References No definition available. + Details
Name: | tr_MultiemployerPlanSurchargeIncreaseDuringPeriod
Namespace Prefix: | tr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Estimated amount of the obligation that would be recognized due to withdrawing from a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References No definition available. + Details
Name: | tr_MultiemployerPlansEstimatedLiabilityUponWithdrawalPlanObligation
Namespace Prefix: | tr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the number of years until the Plan is expected to become insolvent based on the "critical and declining status" designation. + References No definition available. + Details
Name: | tr_MultiemployerPlansNumberOfYearsUntilInsolvent
Namespace Prefix: | tr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents employer payable surcharge to the pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References No definition available. + Details
Name: | tr_MultiemployerPlansSurchargePercentage
Namespace Prefix: | tr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents employer payable compounded annual surcharge for rehabilitation within a specified period to the pension or postretirement benefit plan to which two or more unrelated employers contribute, where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References No definition available. + Details
Name: | tr_MultiemployerPlansSurchargePercentageForRehabilitationInSpecifiedTerm
Namespace Prefix: | tr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- 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 http://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

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_MultiemployerPlansLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |