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Supplemental Cash Flow Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Cash Flow Supplemental Disclosures [Line Items]        
Employee share-based compensation $ 5,457 $ 3,707 $ 10,360 $ 7,163
Unrealized gains on available for sale securities, net of tax     (11) 48
Non-cash increase in goodwill related to the acquisition of Lev Pharmaceuticals, Inc.     86,165  
Cash paid for income taxes     24,119 53,274
Cash paid for interest     $ 2,589 $ 2,050