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Summary of Cash, Cash Equivalents and Marketable Securities Available-for-sale (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Cash, cash equivalents and marketable securities [Line Items]    
Amortized Cost $ 89,157 $ 125,085
Unrealized Gains 13 46
Unrealized Losses (9) (1)
Estimated Fair Value 89,161 125,130
Cash and Cash Equivalents
    
Cash, cash equivalents and marketable securities [Line Items]    
Amortized Cost 17,585 7,599
Estimated Fair Value 17,585 7,599
Cash and Cash Equivalents | Cash
    
Cash, cash equivalents and marketable securities [Line Items]    
Amortized Cost 2,068 1,542
Estimated Fair Value 2,068 1,542
Cash and Cash Equivalents | Money market funds
    
Cash, cash equivalents and marketable securities [Line Items]    
Amortized Cost 15,142 3,140
Estimated Fair Value 15,142 3,140
Cash and Cash Equivalents | Municipal Securities
    
Cash, cash equivalents and marketable securities [Line Items]    
Amortized Cost 375 2,202
Estimated Fair Value 375 2,202
Cash and Cash Equivalents | US Government Agencies Debt Securities
    
Cash, cash equivalents and marketable securities [Line Items]    
Amortized Cost   715
Estimated Fair Value   715
Available-for-sale Securities
    
Cash, cash equivalents and marketable securities [Line Items]    
Amortized Cost 71,572 117,486
Unrealized Gains 13 46
Unrealized Losses (9) (1)
Estimated Fair Value 71,576 117,531
Available-for-sale Securities | US Treasury Securities
    
Cash, cash equivalents and marketable securities [Line Items]    
Amortized Cost 2,499 500
Unrealized Gains 1  
Estimated Fair Value 2,500 500
Available-for-sale Securities | US Government Agencies Debt Securities
    
Cash, cash equivalents and marketable securities [Line Items]    
Amortized Cost 69,073 116,986
Unrealized Gains 12 46
Unrealized Losses (9) (1)
Estimated Fair Value $ 69,076 $ 117,031