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Employee Benefit Plans - SERP (Details) - Non-qualified Supplemental Retirement Plan ("SERP") - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Employee Benefit Plans
Variable life insurance policies investment amount	$ 49.9	$ 49.3
Fair value of plan assets	30.7	26.8
Trading gains (losses), net	2.7	2.6	$ (4.4)
Trading gains (losses), net	$ 2.6	$ 2.8	$ (4.1)

X

- Definition

This element represents the amount of trading gains (losses) on plan assets under the defined benefit plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	res_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

This element represents the amount of trading gains (losses) on plan liabilities under the defined benefit plan.

+ References

No definition available.

+ Details

Name:	res_DefinedBenefitPlanTradingGainsLossesOnLiabilities
Namespace Prefix:	res_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

This element represents the amount of variable life insurance policies included under the company-owned life insurance.

+ References

No definition available.

+ Details

Name:	res_VariableLifeInsurancePoliciesInvestmentAmount
Namespace Prefix:	res_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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

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

X

- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480482/715-20-55-17

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+ Details

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

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: