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Basis of Presentation (Details) | 9 Months Ended
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Sep. 30, 2012
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Percentage of ownership for cost method investment, maximum | 20.00%

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- Definition Represents the maximum percentage of investment in other entities which are being accounted for by using the cost method. + References No definition available. + Details
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Namespace Prefix: | rmbs_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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