Summary of Available-for-Sale Marketable Securities (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities - matures after one year through three years, Amortized cost	$ 38,404	$ 42,810
Amortized cost, Total	48,190	48,253
Available-for-sale securities - matures after one year through three years, Gross unrealized gains	22	9
Gross unrealized gains, Total	26	9
Available-for-sale securities - matures after one year through three years, Gross unrealized losses	(223)	(383)
Gross unrealized losses, Total	(271)	(429)
Available-for-sale securities - matures after one year through three years, Fair value	38,203	42,436
Fair value, Total	47,945	47,833
Certificates of deposits
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities - matures after one year through three years, Amortized cost	1,226	1,975
Available-for-sale securities - matures after one year through three years, Fair value	1,226	1,975
Fair value, Total	1,226	1,975
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities -matures within one year, Amortized cost	9,786	5,443
Available-for-sale securities - matures after one year through three years, Amortized cost	37,178	40,835
Available-for-sale securities - matures within one year, Gross unrealized gains	4
Available-for-sale securities - matures after one year through three years, Gross unrealized gains	22	9
Available-for-sale securities - matures within one year, Gross unrealized losses	(48)	(46)
Available-for-sale securities - matures after one year through three years, Gross unrealized losses	(223)	(383)
Available-for-sale securities - matures within one year, Fair value	9,742	5,397
Available-for-sale securities - matures after one year through three years, Fair value	$ 36,977	$ 40,461

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 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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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Amount after adjustments of available-for-sale debt securities at cost, 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 cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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

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