OTHER EMPLOYEE BENEFITS - Additional Information (Detail) - BioMarin Retirement Savings Plan - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Company's contribution to match employees contribution	100.00%
Employer contribution of maximum percentage over employee's annual compensation	6.00%
Company's contribution from employment commencement	$ 31.6	$ 26.4	$ 28.5

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.

No definition available.

Name:	us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration