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Retirement and Other Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Retirement and Other Benefit Plans - (Details) [Abstract] |  |  |
Number of defined contribution plans maintained by the company | 11 |  |
Defined contribution retirement plan cost | $ 15,200 | $ 14,000 | $ 11,900

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- Definition Number of defined contribution plans maintained by the company. + References No definition available. + Details
Name: | rop_DefinedContributionPlanNumber
Namespace Prefix: | rop_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | rop_RetirementAndOtherBenefitPlansDetailsAbstract
Namespace Prefix: | rop_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 11 + Details
Name: | us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration