The value (monetary amount) of the award the plaintiff seeks in the legal matter.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14557-108349

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349

Name:	us-gaap_LossContingencyDamagesSoughtValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Litigation and contingencies - Additional Information (Detail) € in Millions, $ in Millions	1 Months Ended	115 Months Ended
	Apr. 30, 2007 EUR (€)	Jul. 31, 2011 USD ($)	Dec. 31, 2018 USD ($)	Apr. 30, 2008 EUR (€)
Loss Contingencies [Line Items]
Amount related to unreserved tax-related matters, inclusive of interest \| $			$ 101.0
Ministry of Justice of Belgium
Loss Contingencies [Line Items]
Loss contingency, damages sought value \| €	€ 28.0
Counterclaim against termination of contract \| €				€ 18.5
Pharmaceutical Claims
Loss Contingencies [Line Items]
Loss contingency, damages sought value \| $		$ 68.0