Summary of Available-for-Sale Marketable Securities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale - matures within one year, Amortized cost	$ 5,443
Available-for-sale - matures after one year through three years, Amortized cost	42,810
Amortized cost, Total	48,253	68,554
Available-for-sale - matures after one year through three years, Gross unrealized gains	9
Gross unrealized gains, Total	9	140
Available-for-sale - matures after one year through three years, Gross unrealized losses	(383)
Gross unrealized losses, Total	(429)	(230)
Available-for-sale - matures after one year through three years, Fair value	42,436
Fair value, Total	47,833	68,464
Available-for-sale - matures within one year, Gross unrealized losses	(46)
Available-for-sale - matures within one year, Fair value	5,397
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale - matures within one year, Amortized cost	5,443	2,852
Available-for-sale - matures after one year through three years, Amortized cost	40,835	65,702
Available-for-sale - matures after one year through three years, Gross unrealized gains	9	134
Available-for-sale - matures after one year through three years, Gross unrealized losses	(383)	(227)
Available-for-sale - matures after one year through three years, Fair value	40,461	65,609
Available-for-sale - matures within one year, Gross unrealized gains		6
Available-for-sale - matures within one year, Gross unrealized losses	(46)	(3)
Available-for-sale - matures within one year, Fair value	5,397	2,855
Certificates of deposits
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale - matures after one year through three years, Amortized cost	1,975
Available-for-sale - matures after one year through three years, Fair value	$ 1,975

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

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Available For Sale Matures After One Year Through Three Years Gross Unrealized Loss

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