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Commitments and Contingencies - Additional Information (Detail) $ in Billions	Dec. 31, 2019 USD ($)
Development and Regulatory Milestone Payments
Commitment And Contingencies [Line Items]
Potential milestone payments	$ 4.9

X

- Definition

Commitment and contingencies.

+ References

No definition available.

+ Details

Name:	nbix_CommitmentAndContingenciesLineItems
Namespace Prefix:	nbix_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of potential milestone payments to be paid under a license agreement.

+ References

No definition available.

+ Details

Name:	nbix_PotentialMilestonePayments
Namespace Prefix:	nbix_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_TypeOfArrangementAxis=nbix_ClinicalDevelopmentAndRegulatoryMilestoneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: