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Summary of Available-for-Sale Marketable Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - matures within one year, Amortized cost $ 4,110 $ 10,964
Available-for-sale securities - matures after one year through three years, Amortized cost 76,641 58,155
Amortized cost, Total 80,751 69,119
Available-for-sale securities - matures within one year, Gross unrealized gains 12 73
Available-for-sale securities - matures after one year through three years, Gross unrealized gains 94 393
Gross unrealized gains, Total 106 466
Available-for-sale securities - matures within one year, Gross unrealized losses (6) (4)
Available-for-sale securities - matures after one year through three years, Gross unrealized losses (348) (238)
Gross unrealized losses, Total (354) (242)
Available-for-sale securities - matures within one year, Fair value 4,116 11,033
Available-for-sale securities - matures after one year through three years, Fair value 76,387 58,310
Fair value, Total 80,503 69,343
Corporate bonds
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - matures within one year, Amortized cost 4,110 10,964
Available-for-sale securities - matures after one year through three years, Amortized cost 76,641 55,622
Available-for-sale securities - matures within one year, Gross unrealized gains 12 73
Available-for-sale securities - matures after one year through three years, Gross unrealized gains 94 391
Available-for-sale securities - matures within one year, Gross unrealized losses (6) (4)
Available-for-sale securities - matures after one year through three years, Gross unrealized losses (348) (237)
Available-for-sale securities - matures within one year, Fair value 4,116 11,033
Available-for-sale securities - matures after one year through three years, Fair value 76,387 55,776
Certificates of Deposit
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - matures after one year through three years, Amortized cost   1,960
Available-for-sale securities - matures after one year through three years, Gross unrealized losses   (1)
Available-for-sale securities - matures after one year through three years, Fair value   1,959
Foreign government bond
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - matures after one year through three years, Amortized cost   573
Available-for-sale securities - matures after one year through three years, Gross unrealized gains   2
Available-for-sale securities - matures after one year through three years, Fair value   $ 575