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Available for Sale Debt Securities by Original Contractual Maturity (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
One year or less, amortized cost	$ 94,441	$ 27,752
Greater than one year and less than five years, amortized cost		5,705
Total available-for-sale debt securities, amortized cost	94,441	33,457
One year or less, fair value	94,442	27,727
Greater than one year and less than five years, fair value		5,699
Total available-for-sale debt securities fair value	$ 94,442	$ 33,426

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