Long-Term Debt - Revolving Credit Agreement - Additional Information (Detail) - USD ($)		3 Months Ended
May 06, 2024	Mar. 31, 2024
Senior secured revolving credit agreement [Member]
Debt Instrument [Line Items]
Amount available for general purposes		$ 300,000,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Amount available for issuance of letter of credit under credit facility		$ 0
Revolving Credit Facility [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Collateral coverage ratio		2.00%
Total collateral coverage ratio		1.30%
Revolving Credit Facility [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Aggregate amount of available cash		$ 125,000,000
Revolving Credit Facility [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Line of credit	$ 298,100,000
Amount available for issuance of letter of credit under credit facility	0
Reduction in issuance of additional letters of credit	0
Permits to obtain letter of credit	50,000,000
Letters of credit cash collateralized	$ 25,000,000
Revolving Credit Facility [Member] \| Letter of Credit [Member]
Debt Instrument [Line Items]
Line of credit		$ 1,900,000

Letters of credit cash collateralized.

No definition available.

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Period Type:	duration

- Definition

Line of credit collateral coverage ratio.

+ References

No definition available.

+ Details

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- Definition

Permits to obtain letter of credit.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	duration

- Definition

Reduction in issuance of additional letters of credit.

+ References

No definition available.

+ Details

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Namespace Prefix:	do_
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- Definition

Total collateral coverage ratio.

+ References

No definition available.

+ Details

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- 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.

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Balance Type:	na
Period Type:	duration

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

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-Paragraph 1
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+ Details

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

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-Publisher FASB
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+ Details

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

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

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

- Details

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- Details

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Namespace Prefix:
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