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Investments and Fair Value Measurements - Schedule of Held-to-maturity Investments (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
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Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-Maturity debt instruments | $ 12,145 | $ 11,748
Federal Agency [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-Maturity debt instruments | $ 12,145 | $ 11,748

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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_
Data Type: | xbrli:monetaryItemType
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