Contingencies - Additional Information (Detail) € in Millions, ₪ in Millions, $ in Millions, $ in Millions			1 Months Ended							3 Months Ended
	Aug. 21, 2017 USD ($)	Jul. 15, 2015 USD ($)	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 ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2018 ILS (₪)	Sep. 30, 2016 USD ($)	Mar. 31, 2015 CAD ($)	Mar. 31, 2018 EUR (€)	Mar. 31, 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
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
Punitive damages																			$ 17.9
Fcpa settlement												$ 519.0
Maximum [Member]
Commitment And Contingencies [Line Items]
Compensatory damages and penalties																					$ 12.4
ISRAEL
Commitment And Contingencies [Line Items]
Loss contingency payment										22.0	₪ 75
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					$ 200
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