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Schedule II - Condensed Financial Information of Registrant - Condensed Statements of Income (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
PREMIUMS EARNED AND OTHER REVENUES |  |  |  |  |  |  |  |  |  |  |
Net investment income (expense) | $ 4,448 | $ 3,085 | $ 3,223 | $ 2,704 | $ 3,489 | $ 2,304 | $ 2,142 | $ 1,605 | $ 13,460 | $ 9,540 | $ 5,155
Net realized gains (losses) on investments |  |  |  |  |  |  |  |  | 2,570 | 2,294 | 1,060
Other revenue |  |  |  |  |  |  |  |  | 7,002 | 6,426 | 6,020
Total premiums earned and other revenues | 201,312 | 190,243 | 185,487 | 174,874 | 178,605 | 172,436 | 169,802 | 164,446 | 751,916 | 685,289 | 546,544
OPERATING COSTS AND EXPENSES |  |  |  |  |  |  |  |  |  |  |
General and administrative expenses |  |  |  |  |  |  |  |  | 231,004 | 221,177 | 183,782
Total operating costs and expenses | 142,721 | 173,644 | 137,564 | 127,503 | 155,878 | 128,273 | 114,908 | 123,347 | 581,432 | 522,406 | 371,521
INCOME BEFORE INCOME TAXES |  |  |  |  |  |  |  |  | 170,484 | 162,883 | 175,023
Benefit from income taxes |  |  |  |  |  |  |  |  | 63,549 | 63,473 | 68,539
NET INCOME | $ 36,396 | $ 9,964 | $ 29,376 | $ 31,199 | $ 13,655 | $ 26,882 | $ 33,647 | $ 25,226 | 106,935 | 99,410 | 106,484
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
PREMIUMS EARNED AND OTHER REVENUES |  |  |  |  |  |  |  |  |  |  |
Net investment income (expense) |  |  |  |  |  |  |  |  | 259 | (35) | 22
Net realized gains (losses) on investments |  |  |  |  |  |  |  |  | 255 | 667 | 66
Management fee |  |  |  |  |  |  |  |  | 151 | 138 | 140
Other revenue |  |  |  |  |  |  |  |  | 12 | 80 |
Total premiums earned and other revenues |  |  |  |  |  |  |  |  | 677 | 850 | 228
OPERATING COSTS AND EXPENSES |  |  |  |  |  |  |  |  |  |  |
General and administrative expenses |  |  |  |  |  |  |  |  | 30,819 | 35,342 | 48,056
Total operating costs and expenses |  |  |  |  |  |  |  |  | 30,819 | 35,342 | 48,056
INCOME BEFORE INCOME TAXES |  |  |  |  |  |  |  |  | (30,142) | (34,492) | (47,828)
Benefit from income taxes |  |  |  |  |  |  |  |  | (18,296) | (12,055) | (17,495)
LOSS BEFORE EQUITY IN NET EARNINGS OF SUBSIDIARIES |  |  |  |  |  |  |  |  | (11,846) | (22,437) | (30,333)
Equity in net income of subsidiaries |  |  |  |  |  |  |  |  | 118,781 | 121,847 | 136,817
NET INCOME |  |  |  |  |  |  |  |  | $ 106,935 | $ 99,410 | $ 106,484

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- Definition Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68072869&loc=d3e41242-110953 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(10)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(15)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: 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(8)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + 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 of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=68048583&loc=d3e3636-108311 + Details
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