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Financial Instruments (Cash And Cash Equivalents And Investments From Continuing Operations) (Detail) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2011
Dec. 31, 2010
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]        
Cash $ 107,304 $ 157,317    
Money market funds 101,636 122,827    
Total cash and cash equivalents 208,940 280,144    
Total short-term investments (available-for-sale) 160,666 160,610    
Total cash and cash equivalents and short-term investments 369,606 440,754    
Cash, Gross Unrealized Gain          
Money market funds, Gross Unrealized Gain 372 448    
Total cash and cash equivalents, Gross Unrealized Gain 372 448    
Total short-term investments (available-for-sale), Gross Unrealized Gain   31    
Total cash and cash equivalents and short-term investments, Gross Unrealized Gain 372 479    
Cash, Gross Unrealized (Loss)          
Money market funds, Gross Unrealized (Loss)          
Total cash and cash equivalents, Gross Unrealized (Loss)          
Total short-term investments (available-for-sale), Gross Unrealized (Loss) (50) (34)    
Total cash and cash equivalents and short-term investments, Gross Unrealized (Loss) (50) (34)    
Cash, Fair Value 107,304 157,317    
Money market funds, Fair Value 102,008 123,275    
Total cash and cash equivalents, Fair Value 209,312 280,592 208,913 260,644
Long-term investments (available-for-sale), Fair Value 171,031 171,022    
Total short-term investments (available-for-sale), Fair Value 160,616 160,607    
Total cash and cash equivalents and short-term investments, Fair Value 369,928 441,199    
US Treasury Bill [Member]
       
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]        
Short-term investments (available-for-sale), Cost 133,997 133,648    
Short-term investments (available-for-sale), Gross Unrealized Gain   31    
Short-term investments (available-for-sale), Gross Unrealized (Loss) (47) (5)    
Long-term investments (available-for-sale), Fair Value 133,950 133,674    
U.S. Government Agencies [Member]
       
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]        
Short-term investments (available-for-sale), Cost 26,669 26,962    
Short-term investments (available-for-sale), Gross Unrealized (Loss) (3) (29)    
Long-term investments (available-for-sale), Fair Value 26,666 26,933    
Municipal Bonds [Member]
       
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]        
Long-term investments (available-for-sale), Cost 11,150 11,150    
Long-term investments (available-for-sale), Gross Unrealized Gain          
Long-term investments (available-for-sale), Gross Unrealized (Loss) (735) (735)    
Long-term investments (available-for-sale), Fair Value $ 10,415 $ 10,415