Fair Value Measurement (Details Textual) (USD $) In Millions	6 Months Ended
Jun. 30, 2011
Fair Value (Textuals) [Abstract]
Fair value adjustment on contingent obligation recorded in research and development	$ 4.4
Interest accretion expense	$ 10.7

Name:

wpi_InterestAccretionExpenseOnContingentObligations

Namespace Prefix:

wpi

Data Type:

xbrli:monetaryItemType

Balance Type:

debit

Period Type:

duration