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Financial Instruments - Summary of Bond Activity (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Mar. 31, 2020 | Dec. 31, 2019
Derivative Instruments And Hedging Activities Disclosure [Abstract] |  |
Fair value at beginning of period | $ 60,659 | $ 56,556
Purchases | 3,447 | 27,216
Sales | (13,768) | (1,686)
Maturities and calls | (3,350) | (22,272)
Change in bond premium | (343) | (460)
Fair market value adjustment | (797) | 1,305
Fair value at end of period | $ 45,848 | $ 60,659

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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 Increase (Decrease) in bond premium. + References No definition available. + Details
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- References No definition available. + Details
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- Definition Fair value of firm holdings in corporate fixed income securities. Includes pledged and unpledged holdings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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