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Summary of Cash, Cash Equivalents and Marketable Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Dec. 31, 2011
Cash, cash equivalents and marketable securities [Line Items]        
Amortized Cost $ 504,307 $ 387,196    
Estimated Fair Value 504,307 387,196    
Cash and cash equivalents 504,307 387,196 154,543 82,076
Cash [Member]
       
Cash, cash equivalents and marketable securities [Line Items]        
Amortized Cost 350,469 343,548    
Estimated Fair Value 350,469 343,548    
Cash and cash equivalents 350,469 343,548    
Money market funds [Member]
       
Cash, cash equivalents and marketable securities [Line Items]        
Amortized Cost 2,768 43,648    
Estimated Fair Value 2,768 43,648    
Cash and cash equivalents 2,768 43,648    
Time deposits [Member]
       
Cash, cash equivalents and marketable securities [Line Items]        
Amortized Cost 151,070      
Estimated Fair Value 151,070      
Cash and cash equivalents $ 151,070