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Financial Instruments - Summary of Bond Activity (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Mar. 31, 2014 | Dec. 31, 2013
Derivative Instruments And Hedging Activities Disclosure [Abstract] |  |
Fair value at beginning of period | $ 30,011 | $ 29,776
Purchases | 7,900 | 5,650
Sales |  | (845)
Maturities and calls | (4,150) | (4,050)
Increase (decrease) in bond premium | 840 | (270)
Fair market value adjustment | (35) | (250)
Fair value at end of period | $ 34,566 | $ 30,011

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- Definition Fair market value adjustment of bonds. + References No definition available. + Details
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- Definition Financial instrument maturities and calls of corporate and municipal debt. + References No definition available. + Details
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- Definition Financial instrument purchases of corporate and municipal debt. + References No definition available. + Details
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- Definition Financial instrument sales of corporate and municipal debt. + References No definition available. + Details
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Period Type: | duration

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- Definition Decrease in bond premium. + References No definition available. + Details
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- Details
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- Definition The fair value as of the balance sheet date of firm holdings in fixed income or other debt securities issued by a corporation or other issuer not elsewhere specified in the taxonomy. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=29643736&loc=d3e42546-110969 + Details
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