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Summary of Available-for-Sale Marketable Securities (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
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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

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