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Benefit Plans (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Compensation and Retirement Disclosure [Abstract] |  |  |
Employee contribution limit per calendar year to 401 (k) Plan (as a percent of compensation) | 60.00% |  |
Employer match of employee contributions of first 6% of eligible compensation (as a percent) | 50.00% |  |
Percentage of eligible compensation, matched 50% by employer | 6.00% |  |
Company's contribution to benefit plan | $ 2.1 | $ 1.6 | $ 1.2

X
- Definition The limit of annual employee contributions to the plan per calendar year as a percentage of compensation. + References No definition available. + Details
Name: | rmbs_DefinedContributionPlanEmployeeContributionLimitPercentageOfCompensation
Namespace Prefix: | rmbs_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Employer contribution for Defined benefit plan. + References No definition available. + Details
Name: | rmbs_DefinedContributionPlanEmployerContribution
Namespace Prefix: | rmbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the first level of employee contributions (percentage of compensation) which are matched by the employer. + References No definition available. + Details
Name: | rmbs_DefinedContributionPlanEmployerMatchEmployeeContributionLevelOne
Namespace Prefix: | rmbs_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the employer matching contribution of the first level of employee contributions. + References No definition available. + Details
Name: | rmbs_DefinedContributionPlanEmployerMatchLevelOne
Namespace Prefix: | rmbs_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration