Investments - Summary of Securities with Gross Unrealized Loss Positions Aggregated by Investment Category (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Loss, Less than Twelve Months	$ (347)	$ (795)
Fair Value, Less than Twelve Months	22,319	46,186
Gross Unrealized Loss, Twelve Months or Greater	(269)	(253)
Fair Value, Twelve Months or Greater	1,851	1,299
Gross Unrealized Loss, Total	(616)	(1,048)
Fair Value, Total	24,170	47,485
Fixed-Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Loss, Less than Twelve Months	(145)	(522)
Fair Value, Less than Twelve Months	12,053	35,444
Gross Unrealized Loss, Twelve Months or Greater	(56)	(7)
Fair Value, Twelve Months or Greater	761	230
Gross Unrealized Loss, Total	(201)	(529)
Fair Value, Total	12,814	35,674
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	(1)	(22)
Fair Value, Less than Twelve Months	310	3,291
Gross Unrealized Loss, Twelve Months or Greater
Fair Value, Twelve Months or Greater
Gross Unrealized Loss, Total	(1)	(22)
Fair Value, Total	310	3,291
Fixed-Maturity Securities [Member] | Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Loss, Less than Twelve Months	(67)	(212)
Fair Value, Less than Twelve Months	3,232	9,502
Gross Unrealized Loss, Twelve Months or Greater	(4)	(7)
Fair Value, Twelve Months or Greater	230	230
Gross Unrealized Loss, Total	(71)	(219)
Fair Value, Total	3,462	9,732
Fixed-Maturity Securities [Member] | Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Loss, Less than Twelve Months	(37)	(96)
Fair Value, Less than Twelve Months	1,957	2,179
Gross Unrealized Loss, Twelve Months or Greater	(22)
Fair Value, Twelve Months or Greater	338
Gross Unrealized Loss, Total	(59)	(96)
Fair Value, Total	2,295	2,179
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	(36)	(181)
Fair Value, Less than Twelve Months	6,071	20,233
Gross Unrealized Loss, Twelve Months or Greater	(30)
Fair Value, Twelve Months or Greater	193
Gross Unrealized Loss, Total	(66)	(181)
Fair Value, Total	6,264	20,233
Fixed-Maturity Securities [Member] | Redeemable Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Loss, Less than Twelve Months	(4)	(11)
Fair Value, Less than Twelve Months	483	239
Gross Unrealized Loss, Twelve Months or Greater
Fair Value, Twelve Months or Greater
Gross Unrealized Loss, Total	(4)	(11)
Fair Value, Total	483	239
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Loss, Less than Twelve Months	(202)	(273)
Fair Value, Less than Twelve Months	10,266	10,742
Gross Unrealized Loss, Twelve Months or Greater	(213)	(246)
Fair Value, Twelve Months or Greater	1,090	1,069
Gross Unrealized Loss, Total	(415)	(519)
Fair Value, Total	$ 11,356	$ 11,811