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Consideration Transferred (Parenthetical) (Detail) - USD ($) $ in Thousands			12 Months Ended
	Apr. 01, 2016	Jun. 02, 2014	Dec. 31, 2014
Atoll GmbH
Business Acquisition [Line Items]
Working capital adjustment	$ 74
Refine Technology, LLC
Business Acquisition [Line Items]
Working capital adjustment		$ 66	$ 66

X

- Definition

Business Acquisition Working Capital Adjustments

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
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Period Type:	duration

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=rgen_RefineTechnologyLimitedLiabilityCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: