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Cash Equivalents and Investments - Contractual Maturities of Available-for-Sale Debt Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Investments Debt And Equity Securities [Abstract]    
Due within one year $ 38,100  
Due in 1-5 years 82,511  
Due in 5-10 years 9,389  
Due after 10 years 133,908  
Total $ 263,908 $ 204,457