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Summary of Short-Term Investments (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Schedule of Available-for-sale Securities [Line Items]  
Amortized Cost $ 139,487
Gross Unrealized Gains 32
Gross Unrealized Losses (34)
Estimated Fair Value 139,485
Commercial Paper
 
Schedule of Available-for-sale Securities [Line Items]  
Amortized Cost 36,659
Gross Unrealized Gains 1
Gross Unrealized Losses (12)
Estimated Fair Value 36,648
Corporate Debt Securities
 
Schedule of Available-for-sale Securities [Line Items]  
Amortized Cost 100,806
Gross Unrealized Gains 30
Gross Unrealized Losses (22)
Estimated Fair Value 100,814
US Government Agencies Debt Securities
 
Schedule of Available-for-sale Securities [Line Items]  
Amortized Cost 2,022
Gross Unrealized Gains 1
Estimated Fair Value $ 2,023