Ocean GreatWhite Insurance Claim - Additional Information (Detail) - Hull and Machinery Insurance Policy [Member] $ in Millions	6 Months Ended
Jun. 30, 2024 USD ($)
Business Interruption Loss [Line Items]
Repairs and maintenance cost	$ 51.7
Capital expenditures	4.2
Retired assets with an aggregate net book value	4.4
Incremental cost and other deductable amounts	10.0
Insurance settlements receivable	20.0
Insurance receivable claim	$ 21.7
Percentage of additional loss premium	3.50%

Incremental cost and other deductable amounts.

No definition available.

Name:	do_IncrementalCostAndOtherDeductableAmounts
Namespace Prefix:	do_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Insurance receivable claim amount.

+ References

No definition available.

+ Details

Name:	do_InsuranceReceivableClaimAmount
Namespace Prefix:	do_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Percentage of additional loss premium.

+ References

No definition available.

+ Details

Name:	do_PercentageOfAdditionalLossPremium
Namespace Prefix:	do_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

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

- Definition

Cost of maintenance incurred and directly related to good produced and service rendered.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

+ Details

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

- Definition

Amount of costs recognized in the balance sheet for known or estimated future costs arising from requirements to perform activities to remediate one or more sites.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 410
-SubTopic 30
-Name Accounting Standards Codification
-Section 25
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482049/410-30-25-18

+ Details

Name:	us-gaap_EnvironmentalCostsRecognizedCapitalized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of gain (loss) from the difference between the sale price or salvage price and the book value of an asset that was sold or retired, and gain (loss) from the write down of assets from their carrying value to fair value.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

+ Details

Name:	us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount due in settlement of a claim for reimbursement from an insurance company when the Company has suffered a loss covered under an insurance policy.

+ References

No definition available.

+ Details

Name:	us-gaap_InsuranceSettlementsReceivable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	srt_ProductOrServiceAxis=do_HullAndMachineryInsurancePolicyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: