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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	$ 138,669us-gaap_GoodwillGross	$ 138,669us-gaap_GoodwillGross
Goodwill, Impaired, Accumulated Impairment Loss	(21,770)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss	(21,770)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
Net Carrying Amount	116,899us-gaap_Goodwill	116,899us-gaap_Goodwill	124,969us-gaap_Goodwill
MID
Goodwill [Line Items]
Gross Carrying Amount	19,905us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember	19,905us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember
Goodwill, Impaired, Accumulated Impairment Loss	0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember	0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember
Net Carrying Amount	19,905us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember	19,905us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember	19,905us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = rmbs_MidSegmentMember
CRI
Goodwill [Line Items]
Gross Carrying Amount	96,994us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember	96,994us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember
Goodwill, Impaired, Accumulated Impairment Loss	0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember	0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember
Net Carrying Amount	96,994us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember	96,994us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember	96,994us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = rmbs_CriMember
Other
Goodwill [Line Items]
Gross Carrying Amount	21,770us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	21,770us-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	$ 0us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	$ 0us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember	$ 8,070us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember

X

- 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

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X

- Definition

Amount before 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

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- Definition

Amount of accumulated impairment loss for 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

-Subparagraph (a,h)

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