Commitments and Contingencies - Additional Information (Detail) € in Millions, $ in Millions, $ in Millions				1 Months Ended									3 Months Ended	6 Months Ended
	Jun. 27, 2018 CAD ($)	Aug. 21, 2017 USD ($)	Jul. 15, 2015 USD ($)	Jun. 30, 2018 USD ($)	Nov. 30, 2017 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2013 USD ($)	Aug. 31, 2012 USD ($)	Dec. 31, 2010 USD ($)	Nov. 30, 2009 USD ($)	Aug. 31, 2008 USD ($)	Apr. 30, 2005 USD ($)	Mar. 31, 2015 CAD ($)	Jun. 30, 2018 USD ($) Lawsuit	Jun. 30, 2018 EUR (€)	Jun. 30, 2018 CAD ($)	Jun. 20, 2017 USD ($)	Dec. 31, 2016 USD ($)	May 31, 2015 USD ($)	Mar. 31, 2014 USD ($)	Nov. 30, 2013 USD ($)	Aug. 31, 2013 USD ($)	Jan. 31, 2009 USD ($)	Jul. 31, 2008 USD ($)	Feb. 28, 2005 USD ($)
Commitment And Contingencies [Line Items]
Damages assessment																	$ 235.5
Sales													$ 94
Brand sales					$ 459.0
Modafinil payment																			$ 1,200.0
Modafinil Euro sales \| €															€ 46.5
Annual sales at the time of settlement																							$ 350.0
Annual sales of Effexor		$ 2,600.0
Annual sales of Lamictal																								$ 2,300.0	$ 950.0
Annual sales of Niaspan							$ 1,100.0					$ 416.0
Annual sales of Lidoderm							$ 1,400.0														$ 1,200.0
Annual sales of Aggrenox			$ 455.0								$ 340.0
Annual sales of Actos								$ 2,800.0	$ 3,700.0
Annual sales of Acto plus								$ 430.0	$ 500.0
Nexium settlement payment						$ 24.0
Annual sales of Namenda										$ 1,100.0				$ 1,400.0
Annual sales of Intuniv						$ 327.0												$ 335.0
Compensatory damages for the state of Illinois														$ 90.0
Compensatory Damages And Penalties																						$ 12.4
Punitive Damages																				$ 17.9
Number of lawsuits filed \| Lawsuit														1,000
Israel [Member]
Commitment And Contingencies [Line Items]
Loss contingency payment														$ 22.0
Statutory Penalties [Member] \| Minimum [Member]
Commitment And Contingencies [Line Items]
Damage claimed														362.0
Statutory Penalties [Member] \| Maximum [Member]
Commitment And Contingencies [Line Items]
Damage claimed														1,200.0
Eosinophilic Esophagitis [Member]
Commitment And Contingencies [Line Items]
Damage claimed														200.0
Eosinophilic Esophagitis [Member] \| United States [Member]
Commitment And Contingencies [Line Items]
Damage claimed														150.0
Eosinophilic Esophagitis [Member] \| Europe [Member]
Commitment And Contingencies [Line Items]
Damage claimed														50.0
Janssen and Millennium [Member]
Commitment And Contingencies [Line Items]
Maximum damages payable				$ 159.0										$ 159.0		$ 200
Litigation settlement awarded from other party	$ 5
AbbVie [Member]
Commitment And Contingencies [Line Items]
Litigation settlement awarded from other party				$ 448.0
AndroGel Rate at 1% [Member]
Commitment And Contingencies [Line Items]
Annual sales at the time of settlement																							140.0
AndroGel Rate at 1.62% [Member]
Commitment And Contingencies [Line Items]
Annual sales at the time of settlement																							$ 1,050.0