Summary of Available-for-Sale Marketable Securities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale - matures within one year, Amortized cost		$ 10,964
Available-for-sale - matures after one year through three years, Amortized cost		58,155
Amortized cost, Total	68,554	69,119
Available-for-sale - matures within one year, Gross unrealized gains		73
Available-for-sale - matures after one year through three years, Gross unrealized gains		393
Gross unrealized gains, Total	140	466
Available-for-sale - matures within one year, Gross unrealized losses		(4)
Available-for-sale - matures after one year through three years, Gross unrealized losses		(238)
Gross unrealized losses, Total	(230)	(242)
Available-for-sale - matures within one year, Fair value		11,033
Available-for-sale - matures after one year through three years, Fair value		58,310
Fair value, Total	68,464	69,343
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale - matures within one year, Amortized cost	2,852	10,964
Available-for-sale - matures after one year through three years, Amortized cost	65,702	55,622
Available-for-sale - matures within one year, Gross unrealized gains	6	73
Available-for-sale - matures after one year through three years, Gross unrealized gains	134	391
Available-for-sale - matures within one year, Gross unrealized losses	(3)	(4)
Available-for-sale - matures after one year through three years, Gross unrealized losses	(227)	(237)
Available-for-sale - matures within one year, Fair value	2,855	11,033
Available-for-sale - matures after one year through three years, Fair value	65,609	55,776
Certificates of deposits
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale - matures after one year through three years, Amortized cost		1,960
Available-for-sale - matures after one year through three years, Gross unrealized gains
Available-for-sale - matures after one year through three years, Gross unrealized losses		(1)
Available-for-sale - 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 - matures after one year through three years, Amortized cost		573
Available-for-sale - matures after one year through three years, Gross unrealized gains		2
Available-for-sale - matures after one year through three years, Gross unrealized losses
Available-for-sale - matures after one year through three years, Fair value		$ 575

Available for sale matures after one year through three years, gross unrealized gains.

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Available for sale matures within one year, gross unrealized gains.

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Available For Sale Matures Within One Year Gross Unrealized Loss

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Available for sale securities debt maturities rolling year two through three amortized cost basis.

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Available for sale securities debt maturities rolling year two through three fair value.

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Available For Sale Securities Gross Unrealized Gains Recognized In Accumulated Other Comprehensive Income And Earnings

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Amount of accumulated pre-tax unrealized loss before deducting pre-tax unrealized gain on investments in available-for-sale securities impacting investments.

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Amount of available-for-sale debt securities at cost, net of adjustments, which include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the next fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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Amount of available-for-sale debt securities at fair value maturing in the next fiscal year following the latest fiscal year.

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Amount of debt securities categorized neither as held-to-maturity nor trading.

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