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Liability for Unpaid Losses and Loss Adjustment Expenses - Summary of Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance (Detail) $ in Thousands | Dec. 31, 2017 USD ($) Claim | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
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Claims Development [Line Items] |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 988,139 |  |  |  |
Accident Year 2013 [Member] |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 91,065 | $ 88,493 | $ 96,012 | $ 96,993 | $ 100,111
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development (Redundancy) on Reported Claims | $ (4,704) |  |  |  |
Cumulative Number of Reported Claims | Claim | 20,440 |  |  |  |
Accident Year 2014 [Member] |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 112,278 | 112,251 | 118,289 | $ 111,739 |
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development (Redundancy) on Reported Claims | $ (10,886) |  |  |  |
Cumulative Number of Reported Claims | Claim | 22,420 |  |  |  |
Accident Year 2015 [Member] |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 194,600 | 187,431 | $ 170,381 |  |
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development (Redundancy) on Reported Claims | $ (15,635) |  |  |  |
Cumulative Number of Reported Claims | Claim | 26,703 |  |  |  |
Accident Year 2016 [Member] |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 286,252 | $ 269,814 |  |  |
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development (Redundancy) on Reported Claims | $ (17,785) |  |  |  |
Cumulative Number of Reported Claims | Claim | 39,885 |  |  |  |
Accident Year 2017 [Member] |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 303,944 |  |  |  |
Total of Incurred-but-Not-Reported Liabilities Plus Expected Development (Redundancy) on Reported Claims | $ 49,600 |  |  |  |
Cumulative Number of Reported Claims | Claim | 93,080 |  |  |  |

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- Definition Undiscounted amount, after reinsurance, of incurred claims and allocated claim adjustment expense used in claims development for short-duration insurance contracts. Excludes unallocated claim adjustment expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65670685&loc=SL65671311-158438 + Details
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