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Investments and Fair Value Measurements - Schedule of Investments (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-Maturity Debt instrument | $ 11,748 | $ 11,036
Federal agency [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-Maturity Debt instrument | $ 11,748 | $ 11,036

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- Definition Amount before other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration