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Cash Equivalents and Investments (Summary of Cash and Available-For-Sale Securities) (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Dec. 31, 2011
Schedule of Available-For-Sale Securities [Line Items]        
Adjusted Cost $ 207,207 $ 168,679    
Unrealized Gains 6 10    
Unrealized Losses 0 0    
Cash, Cash Equivalents and Available-for-Sale Securities, Fair Value 207,213 168,689    
Cash and Cash Equivalents 182,192 [1] 131,212 [2] 141,368 168,544
Restricted Investment 20,000 20,000    
Short-Term Marketable Securities 5,021 [1] 17,477 [2]    
Long-Term Marketable Securities 0 0    
Cash [Member]
       
Schedule of Available-For-Sale Securities [Line Items]        
Adjusted Cost 7,672 7,894    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Cash and Cash Equivalents, Fair Value 7,672 7,894    
Cash and Cash Equivalents 7,672 7,894    
Restricted Investment 0 0    
Short-Term Marketable Securities 0 0    
Long-Term Marketable Securities 0 0    
Money Market Funds [Member]
       
Schedule of Available-For-Sale Securities [Line Items]        
Adjusted Cost 173,532 121,095    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Cash and Cash Equivalents, Fair Value 173,532 121,095    
Cash and Cash Equivalents 173,532 121,095    
Restricted Investment 0 0    
Short-Term Marketable Securities 0 0    
Long-Term Marketable Securities 0 0    
Certificate of Deposit [Member]
       
Schedule of Available-For-Sale Securities [Line Items]        
Adjusted Cost 20,988 26,128    
Unrealized Gains 0 0    
Unrealized Losses 0 0    
Cash and Cash Equivalents, Fair Value 20,988 26,128    
Cash and Cash Equivalents 988 2,223    
Restricted Investment 20,000 20,000    
Short-Term Marketable Securities 0 3,905    
Long-Term Marketable Securities 0 0    
Corporate Debt Securities [Member]
       
Schedule of Available-For-Sale Securities [Line Items]        
Adjusted Cost 5,015 13,562    
Unrealized Gains 6 10    
Unrealized Losses 0 0    
Available for Sale Securities, Fair Value 5,021 13,572    
Cash and Cash Equivalents 0 0    
Restricted Investment 0 0    
Short-Term Marketable Securities 5,021 13,572    
Long-Term Marketable Securities $ 0 $ 0    
[1] unaudited
[2] Note 1