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Commitments and Contingencies - Additional Information (Detail) $ in Billions	12 Months Ended
	Dec. 31, 2018 USD ($)
Minimum
Commitment And Contingencies [Line Items]
Lease cancellation, notice period	0 days
Maximum
Commitment And Contingencies [Line Items]
Lease cancellation, notice period	180 days
Milestone payables	$ 1.0
Royalty, rate	6.00%

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

Lease cancellation notice period.

+ References

No definition available.

+ Details

Name:	nbix_LeaseCancellationNoticePeriod
Namespace Prefix:	nbix_
Data Type:	xbrli:durationItemType
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

- Definition

Royalty rate percentage.

+ References

No definition available.

+ Details

Name:	nbix_RoyaltyRatePercentage
Namespace Prefix:	nbix_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: