Goodwill and Intangible Assets - Additional Information (Detail) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2020 USD ($) product	Jun. 30, 2020 USD ($) product	Dec. 31, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)
Goodwill [Line Items]
Goodwill	$ 527,475	$ 527,475	$ 419,504			$ 426,226
Impairment charges	1,000
Intangible assets acquired		131,000
Product rights intangible asset	1,323,585	1,323,585	1,200,535
In-process research and development	$ 381,115	$ 381,115	382,075
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Creo Pharma Holding Limited
Goodwill [Line Items]
Carrying value, intangible assets sold					$ 7,000
In-process research and development
Goodwill [Line Items]
Intangible assets impairment, number of products experiencing impairment | product		2
Intangible assets impairment, number of in process products experiencing estimated launch date delays | product		1
Marketed products
Goodwill [Line Items]
Intangible assets impairment, number of products experiencing impairment | product	3
Intangible assets impairment, number of products experiencing price erosion | product	2
Product rights
Goodwill [Line Items]
Product rights intangible asset	$ 1,189,785	$ 1,189,785	1,197,535
Product rights | JSP License And Commercialization Agreement
Goodwill [Line Items]
Product rights intangible asset				$ 50,000
Customer relationships | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Creo Pharma Holding Limited
Goodwill [Line Items]
Carrying value, intangible assets sold				5,000
Trade name
Goodwill [Line Items]
Product rights intangible asset	133,800	133,800	3,000
Trade name | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Creo Pharma Holding Limited
Goodwill [Line Items]
Carrying value, intangible assets sold				$ 2,000
Specialty
Goodwill [Line Items]
Goodwill	361,000	361,000	361,000
Generics
Goodwill [Line Items]
Goodwill	93,000	93,000	$ 59,000
Impairment charges		3,000
Generics | In-process research and development
Goodwill [Line Items]
Impairment charges		$ 1,000
Intangible assets impairment, number of products experiencing impairment | product		2
Generics | Marketed products
Goodwill [Line Items]
Intangible assets impairment, number of products experiencing impairment | product		5
Intangible assets impairment, number of products experiencing price erosion | product		4
Generics | Cost of goods sold
Goodwill [Line Items]
Impairment charges		$ 2,000
AvKARE
Goodwill [Line Items]
Goodwill	$ 73,000	$ 73,000