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Subsequent Event - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
0 Months Ended 1 Months Ended 3 Months Ended
Jul. 31, 2012
May 08, 2013
Subsequent Event [Member]
Jul. 31, 2012
Litigation Related to Breg [Member]
May 24, 2012
Litigation Related to Breg [Member]
Mar. 31, 2013
Past Liability Due [Member]
Mar. 31, 2013
Future Liability [Member]
Subsequent Event [Line Items]            
Share repurchase program, authorized amount   $ 50        
Charges accrued in connection with litigation       4.2    
Estimated reimbursement         13 15
Compensatory damages to plaintiff     2.1      
Exemplary damages     7      
Accrual and related charge to discontinued operations $ 4.2