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Schedule II. Condensed Financial Information of Registrant - Condensed Statements of Income (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Revenues |  |  |  |  |  |  |  |  |  |  |
Net investment income | $ 6,763 | $ 6,947 | $ 6,649 | $ 6,670 | $ 6,698 | $ 6,801 | $ 6,605 | $ 6,914 | $ 27,029 | $ 27,018 | $ 26,340
Fee and other income |  |  |  |  |  |  |  |  | 534 | 562 | 1,080
Total revenues | 94,309 | 88,003 | 87,511 | 86,512 | 85,583 | 80,374 | 76,637 | 78,654 | 356,335 | 321,248 | 280,663
Expenses |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  | 566 | 1,311
Total expenses |  |  |  |  |  |  |  |  | 297,131 | 284,105 | 253,306
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 15,567 | 7,790 | 3,176
Net income | 17,443 | 9,699 | 7,644 | 8,851 | 9,226 | 7,121 | 3,445 | 9,561 | 43,637 | 29,353 | 24,181
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | 1,051 | 571 | 478
Fee and other income |  |  |  |  |  |  |  |  | 5,453 | 4,765 | 9,710
Total revenues |  |  |  |  |  |  |  |  | 6,504 | 5,336 | 10,188
Expenses |  |  |  |  |  |  |  |  |  |  |
Other operating costs |  |  |  |  |  |  |  |  | 6,504 | 4,770 | 4,827
Interest expense |  |  |  |  |  |  |  |  |  | 566 | 1,311
Total expenses |  |  |  |  |  |  |  |  | 6,504 | 5,336 | 6,138
Income (loss) before income taxes and equity in earnings of subsidiaries |  |  |  |  |  |  |  |  |  |  | 4,050
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 6 | (9) | 1,213
Gain (loss) before equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | (6) | 9 | 2,837
Equity in net income of subsidiaries |  |  |  |  |  |  |  |  | 43,643 | 29,344 | 21,344
Net income |  |  |  |  |  |  |  |  | $ 43,637 | $ 29,353 | $ 24,181

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