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Financial Instruments - Summary of Bond Activity (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
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Sep. 30, 2015 | Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Fair value at beginning of period | $ 38,399 | $ 30,011
Purchases | 12,494 | 14,089
Sales |  | (245)
Maturities and calls | (8,865) | (6,426)
Increase in bond premium | 148 | 1,155
Fair market value adjustment | 39 | (185)
Fair value at end of period | $ 42,215 | $ 38,399

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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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- Definition Decrease in bond premium. + References No definition available. + Details
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- References No definition available. + 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=35711157&loc=d3e42546-110969 + Details
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