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Available for Sale Securities by Original Contractual Maturity (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Carrying Value |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Due in one year or less | $ 10,268 | $ 8,683
Due greater than three years and less than five years | 0 | 287
Total available-for-sale securities | 10,268 | 8,970
Fair Value |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Due in one year or less | 10,268 | 8,683
Due greater than three years and less than five years | 0 | 287
Total available-for-sale securities | $ 10,268 | $ 8,970

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- Definition Available-for-sale securities by contractual maturity. + References No definition available. + Details
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- Definition Available-for-sale securities by contractual maturity due greater than three years and less than five years. + References No definition available. + Details
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- Definition Available-for-sale securities by contractual maturity due in one year. + References No definition available. + Details
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- Details
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