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Business Segment Information - Summary of selected information between United States and all international locations (Details 1) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |
Revenues | $ 1,263,840 | $ 2,337,413 | $ 1,861,489
United States Revenues |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 1,191,704 | 2,249,260 | 1,795,592
International Revenues |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | $ 72,136 | $ 88,153 | $ 65,897

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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- Details
Name: | us-gaap_StatementGeographicalAxis=res_UnitedStatesServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementGeographicalAxis=res_InternationalServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |