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v2.4.1.9

NOTES PAYABLE TO BANKS - Interest incurred on credit facility, interest capitalized related to facilities and equipment under construction, and related weighted average interest rates (Details) (Revolving credit facility, USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Revolving credit facility |  |
Line of Credit Facility [Line Items] |  |
Interest incurred | $ 844 us-gaap_InterestCostsIncurred / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember | $ 414 us-gaap_InterestCostsIncurred / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember
Capitalized interest | $ 179 res_CapitalizedInterestRelatedToFacilitiesAndEquipmentUnderConstruction / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember | $ 97 res_CapitalizedInterestRelatedToFacilitiesAndEquipmentUnderConstruction / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember
Weighted average interest rate | 1.60%res_WeightedAverageInterestRateOnCreditFacility / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember | 3.40%res_WeightedAverageInterestRateOnCreditFacility / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember

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- Definition This represents amount for capitalized interest related to facilities and equipment under construction. + References No definition available. + Details
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Namespace Prefix: | res_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition It represents percentage for weighted average interest rate. + References No definition available. + Details
Name: | res_WeightedAverageInterestRateOnCreditFacility
Namespace Prefix: | res_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Total interest costs incurred during the period and either capitalized or charged against earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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