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Consolidated Statements of Changes in Stockholders' Equity Parenthetical (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Consolidated Statements of Changes in Stockholders' Equity [Abstract] |  |  |
Currency translation adjustments, tax | $ 3,916 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax | $ 2,406 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax | $ 907 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax
Conversion of senior subordinated convertible notes, tax | $ 115 rop_ConversionOfSeniorSubordinatedConvertibleNotesTax |  |
Dividends declared (in dollars per share) | $ 0.85 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.70 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.58 us-gaap_CommonStockDividendsPerShareDeclared

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- Definition Amount of tax expense (benefit) related to the conversion of senior subordinated convertible notes. + References No definition available. + Details
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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Amount of tax expense (benefit), after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e640-108580 + Details
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