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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

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