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Schedule VI - Supplemental Information Concerning Consolidated Property and Casualty Insurance Operations (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Supplemental Information For Property Casualty Insurance Underwriters [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Reserves for Unpaid Losses and LAE | $ 248,425 |  |  |  | $ 58,494 |  |  |  | $ 248,425 | $ 58,494 | $ 98,840 | $ 134,353
Incurred Loss and LAE Current Year |  |  |  |  |  |  |  |  | 322,929 | 305,919 | 188,040 |
Incurred Loss and LAE Prior Years |  |  |  |  |  |  |  |  | 27,499 | (4,690) | (301) |
Paid Losses and LAE |  |  |  |  |  |  |  |  | 342,796 | 328,141 | 189,442 |
Net Investment Income | 4,448 | $ 3,085 | $ 3,223 | $ 2,704 | 3,489 | $ 2,304 | $ 2,142 | $ 1,605 | 13,460 | 9,540 | 5,155 |
Deferred Policy Acquisition Cost ("DPAC") | 73,059 |  |  |  | 64,912 |  |  |  | 73,059 | 64,912 | 60,019 | $ 25,660
Amortization of DPAC |  |  |  |  |  |  |  |  | (136,702) | (125,350) | (87,871) |
Net Premiums Written |  |  |  |  |  |  |  |  | 737,060 | 656,094 | 626,448 |
Net Premiums Earned | 183,708 | $ 174,517 | $ 169,009 | $ 161,559 | 163,973 | $ 159,534 | $ 156,461 | $ 152,448 | 688,793 | 632,416 | 503,999 |
Unearned premiums | $ 532,444 |  |  |  | $ 475,756 |  |  |  | $ 532,444 | $ 475,756 | $ 442,366 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (cc) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 + Details
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- Definition Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(2)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16(Column G)) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574960-122915 + Details
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- Definition Amount, after effects of reinsurance, of expense for claims incurred in the current reporting period and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e575016-122915 + Details
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