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Liability for Losses and Loss Expenses - Reconciliation of Net Incurred and Paid Claims Development Tables to Liability for Claims and Claim Adjustment Expenses (Detail) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | $ 470,940,000 |  |  |
Reinsurance recoverable | 348,332,000 |  |  |
Unallocated loss adjustment expenses | 50,402,000 |  |  |
Gross liability for unpaid losses and loss expenses | 869,673,849 | $ 814,665,224 | $ 676,671,727 | $ 606,664,590
Personal Automobile [Member] |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 122,094,000 |  |  |
Reinsurance recoverable | 119,364,000 |  |  |
Homeowners [Member] |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 20,762,000 |  |  |
Reinsurance recoverable | 10,216,000 |  |  |
Commercial Automobile [Member] |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 118,372,000 |  |  |
Reinsurance recoverable | 70,973,000 |  |  |
Commercial MultiPeril [Member] |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 95,153,000 |  |  |
Reinsurance recoverable | 58,765,000 |  |  |
Workers Compensation [Member] |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 102,035,000 |  |  |
Reinsurance recoverable | 81,837,000 |  |  |
Other [Member] |  |  |  |
Claims Development [Line Items] |  |  |  |
Net outstanding liabilities | 12,524,000 |  |  |
Reinsurance recoverable | $ 7,177,000 |  |  |

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- Definition Liability as of the balance sheet date for the estimated ultimate cost of settling claims and claim adjustment expense relating to insured events that have occurred on or before the balance sheet date for those liabilities owed to another party as a result of assuming another insurer's primary obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (cc) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (cc) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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- Definition The amount needed to reflect the estimated ultimate cost of settling asserted and unasserted claims estimated to have been incurred by the insureds on or before the balance sheet date pertaining to the existence of a lien, encumbrance, defect or other matter purportedly affecting the title to the interest as insured. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (cc) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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- Definition Amount before valuation allowance recoverable under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves. + References No definition available. + Details
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