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Impact of New Accounting Standards - Additional Information (Detail) - USD ($) |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2018 | Dec. 31, 2019 | Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Gain on equity securities |  | $ 8,900,000 | $ 1,200,000
Loss on equity securities |  | $ 25,751 | $ 4,400,000
Accounting Standards Update 2016-01 [Member] | Accumulated Net Unrealized Investment Losses [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Reclassification from AOCI to retained earnings | $ 4,900,000 |  |

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- Definition Amount of the cumulative effect on retained earnings net of related income tax effect. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22663-107794 + Details
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