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Investments - Summary of Securities with Gross Unrealized Loss Positions Aggregated by Investment Category (Detail) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Loss, Less than Twelve Months | $ (3,069) | $ (1,961)
Fair Value, Less than Twelve Months | 116,372 | 41,010
Gross Unrealized Loss, Twelve Months or Greater | (92) | (103)
Fair Value, Twelve Months or Greater | 2,410 | 5,819
Gross Unrealized Loss, Total | (3,161) | (2,064)
Fair Value, Total | 118,782 | 46,829
Fixed-Maturity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Loss, Less than Twelve Months | (1,542) | (512)
Fair Value, Less than Twelve Months | 91,658 | 22,162
Gross Unrealized Loss, Twelve Months or Greater | (66) | (21)
Fair Value, Twelve Months or Greater | 1,576 | 1,200
Gross Unrealized Loss, Total | (1,608) | (533)
Fair Value, Total | 93,234 | 23,362
Fixed-Maturity Securities [Member] | U.S. Treasury and U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Loss, Less than Twelve Months | (9) | (8)
Fair Value, Less than Twelve Months | 3,224 | 2,485
Gross Unrealized Loss, Total | (9) | (8)
Fair Value, Total | 3,224 | 2,485
Fixed-Maturity Securities [Member] | Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Loss, Less than Twelve Months | (789) | (428)
Fair Value, Less than Twelve Months | 33,325 | 12,720
Gross Unrealized Loss, Twelve Months or Greater | (18) | (2)
Fair Value, Twelve Months or Greater | 982 | 998
Gross Unrealized Loss, Total | (807) | (430)
Fair Value, Total | 34,307 | 13,718
Fixed-Maturity Securities [Member] | Asset-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Loss, Less than Twelve Months | (3) |
Fair Value, Less than Twelve Months | 1,234 | 209
Gross Unrealized Loss, Total | (3) |
Fair Value, Total | 1,234 | 209
Fixed-Maturity Securities [Member] | Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Loss, Less than Twelve Months | (95) | (3)
Fair Value, Less than Twelve Months | 10,365 | 1,018
Gross Unrealized Loss, Total | (95) | (3)
Fair Value, Total | 10,365 | 1,018
Fixed-Maturity Securities [Member] | State, Municipalities, and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Loss, Less than Twelve Months | (609) | (19)
Fair Value, Less than Twelve Months | 40,529 | 3,144
Gross Unrealized Loss, Twelve Months or Greater | (48) | (19)
Fair Value, Twelve Months or Greater | 594 | 202
Gross Unrealized Loss, Total | (657) | (38)
Fair Value, Total | 41,123 | 3,346
Fixed-Maturity Securities [Member] | Redeemable Preferred Stock [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Loss, Less than Twelve Months | (37) | (54)
Fair Value, Less than Twelve Months | 2,981 | 2,586
Gross Unrealized Loss, Total | (37) | (54)
Fair Value, Total | 2,981 | 2,586
Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Loss, Less than Twelve Months | (1,527) | (1,449)
Fair Value, Less than Twelve Months | 24,714 | 18,848
Gross Unrealized Loss, Twelve Months or Greater | (26) | (82)
Fair Value, Twelve Months or Greater | 834 | 4,619
Gross Unrealized Loss, Total | (1,553) | (1,531)
Fair Value, Total | $ 25,548 | $ 23,467

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 + Details
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