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Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
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	$ 1.8	$ 2.1	$ 1.6

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