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Available for Sale Securities by Original Contractual Maturity (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Due in one year or less, amortized cost	$ 24,509	$ 10,268
Due greater than one year and less than five years, amortized cost	12,357
Total available-for-sale securities, amortized cost	36,866	10,268
Due in one year or less, fair value	24,492	10,268
Due greater than one year and less than five years, fair value	12,341
Total available-for-sale securities, fair value	$ 36,833	$ 10,268

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Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the second fiscal year through the fifth 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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