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Employee Benefit Plans (Detail Textuals 1) - Supplemental Retirement Plan ('SERP') - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items] |  |  |
Variable life insurance policies investment amount | $ 47,700,000 | $ 46,800,000 |
Fair value of plan assets | 18,367,000 | 16,081,000 |
Trading (losses) gains related to the SERP assets | $ 966,000 | $ (519,000) | $ 959,000

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- Definition This element represents the amount of trading gains (losses) of plan assets under the defined benefit plan. + References No definition available. + Details
Name: | res_DefinedBenefitPlanTradingGainsLosses
Namespace Prefix: | res_
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Balance Type: | credit
Period Type: | duration

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- 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

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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. + References No definition available. + Details
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Period Type: | duration

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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=64937038&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6749337 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6520858 + Details
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Balance Type: | debit
Period Type: | instant

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- Details
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