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Intangible Assets and Goodwill (Goodwill Information) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | --- | ---
Goodwill [Line Items] |  |  |
Gross Carrying Amount | $ 138,669 us-gaap_GoodwillGross | $ 138,669 us-gaap_GoodwillGross |
Goodwill, Impaired, Accumulated Impairment Loss | (21,770)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss | (21,770)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss |
Net Carrying Amount | 116,899 us-gaap_Goodwill | 116,899 us-gaap_Goodwill | 124,969 us-gaap_Goodwill
MID |  |  |
Goodwill [Line Items] |  |  |
Gross Carrying Amount | 19,905 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember | 19,905 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember |
Goodwill, Impaired, Accumulated Impairment Loss | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember |
Net Carrying Amount | 19,905 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember | 19,905 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember | 19,905 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember
CRI |  |  |
Goodwill [Line Items] |  |  |
Gross Carrying Amount | 96,994 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember | 96,994 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember |
Goodwill, Impaired, Accumulated Impairment Loss | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember |
Net Carrying Amount | 96,994 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember | 96,994 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember | 96,994 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember
Other |  |  |
Goodwill [Line Items] |  |  |
Gross Carrying Amount | 21,770 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 21,770 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
Goodwill, Impaired, Accumulated Impairment Loss | (21,770)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (21,770)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
Net Carrying Amount | $ 0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | $ 0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | $ 8,070 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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