Contingencies And Commitments [Line Items]

No definition available.

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- Definition

Aggregate face value of letters of credit and performance, bid, supersedes, tax appeal and customs bonds outstanding at period end, for which the entity has a contingent liability.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Period covered by the long-term contractual obligation, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	ck0000949039_ContractualObligationPeriod
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Period Type:	duration

- Definition

Range of risk retained by the entity for marine liability claims, including personal injury claims before the entity's insurance arrangement begins to provide coverage (upper limit).

+ References

No definition available.

+ Details

Name:	ck0000949039_RangeOfDeductibleForLiabilityCoverageForPersonalInjuryClaimsUpperLimit
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of contractual obligation to be paid in remainder of current fiscal year.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32718-109319

+ Details

Name:	us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of loss contingency liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

Reference 2: http://www.xbrl.org/2003/role/recommendedDisclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 10
-URI https://asc.fasb.org/extlink&oid=121557415&loc=d3e14615-108349

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

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Namespace Prefix:
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Balance Type:
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- Details

Name:	srt_RangeAxis=srt_MinimumMember
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- Details

Name:	us-gaap_LossContingenciesByNatureOfContingencyAxis=us-gaap_LossFromCatastrophesMember
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- Details

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- Details

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- Details

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- Details

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- Details

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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Feb. 29, 2016	Mar. 31, 2023	Dec. 31, 2022
Contingencies And Commitments [Line Items]
Estimated sales tax and related penalties and interest		$ 12.6	$ 12.4
Purchase Obligations		0.0
Maximum [Member]
Contingencies And Commitments [Line Items]
Range of deductible for liability coverage for personal injury claims, upper limit		5.0
Minimum [Member]
Contingencies And Commitments [Line Items]
Range of deductible for liability coverage for personal injury claims, upper limit		1.0
Loss from Catastrophes [Member]
Contingencies And Commitments [Line Items]
Range of deductible for liability coverage for personal injury claims, upper limit		100.0
Personal Injury Claims [Member]
Contingencies And Commitments [Line Items]
Personal injury claims recorded		18.4	18.3
Total Contingent Liabilities Under Letters of Credit and Bonds [Member]
Contingencies And Commitments [Line Items]
Contingent liability under letters of credit and other bonds		19.4
Services Agreement [Member]
Contingencies And Commitments [Line Items]
Maturity of service arrangement	10 years
Annual payments due under service agreement		27.0
Accrued Liabilities [Member] \| Personal Injury Claims [Member]
Contingencies And Commitments [Line Items]
Personal injury claims recorded		5.3	3.7
Other Liabilities [Member] \| Personal Injury Claims [Member]
Contingencies And Commitments [Line Items]
Personal injury claims recorded		$ 13.1	$ 14.6