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Basis of Presentation (Details)	3 Months Ended
	Mar. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Percentage of ownership for cost method investment, maximum	20.00%rmbs_CostMethodInvestmentOwnershipPercentageMaximum

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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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Data Type:	num:percentItemType
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Period Type:	duration

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- Details

Name:	us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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