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Investments - Schedule of Investments (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Schedule of Investments [Line Items] |  |
Short-Term | $ 6,457 | $ 6,584
Long-Term | 57,511 | 47,593
Municipal Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Short-Term | 5,492 | 6,088
Long-Term | 34,495 | 27,563
Federal Home Loan Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Short-Term |  |
Long-Term | 22,520 | 18,569
Certificates of Deposit [Member] |  |
Schedule of Investments [Line Items] |  |
Short-Term | 965 | 496
Long-Term | $ 496 | $ 1,461

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- Definition Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity, expected to be converted to cash, sold or exchanged within one year or the normal operating cycle. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 + Details
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