Investments - Summary of Securities with Gross Unrealized Loss Positions Aggregated by Investment Category (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Loss, Less than Twelve Months	$ (1,195)	$ (795)
Fair Value, Less than Twelve Months	40,156	46,186
Gross Unrealized Loss, Twelve Months or Greater	(290)	(253)
Fair Value, Twelve Months or Greater	4,525	1,299
Gross Unrealized Loss, Total	(1,485)	(1,048)
Fair Value, Total	44,681	47,485
Fixed-Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Loss, Less than Twelve Months	(215)	(522)
Fair Value, Less than Twelve Months	20,771	35,444
Gross Unrealized Loss, Twelve Months or Greater	(67)	(7)
Fair Value, Twelve Months or Greater	2,797	230
Gross Unrealized Loss, Total	(282)	(529)
Fair Value, Total	23,568	35,674
Fixed-Maturity Securities [Member] | Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Loss, Less than Twelve Months	(151)	(212)
Fair Value, Less than Twelve Months	11,164	9,502
Gross Unrealized Loss, Twelve Months or Greater	(6)	(7)
Fair Value, Twelve Months or Greater	1,224	230
Gross Unrealized Loss, Total	(157)	(219)
Fair Value, Total	12,388	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	(5)	(96)
Fair Value, Less than Twelve Months	283	2,179
Gross Unrealized Loss, Twelve Months or Greater	(35)
Fair Value, Twelve Months or Greater	1,377
Gross Unrealized Loss, Total	(40)	(96)
Fair Value, Total	1,660	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	(15)	(181)
Fair Value, Less than Twelve Months	4,085	20,233
Gross Unrealized Loss, Twelve Months or Greater	(26)
Fair Value, Twelve Months or Greater	196
Gross Unrealized Loss, Total	(41)	(181)
Fair Value, Total	4,281	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	(44)	(11)
Fair Value, Less than Twelve Months	5,239	239
Gross Unrealized Loss, Total	(44)	(11)
Fair Value, Total	5,239	239
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		(22)
Fair Value, Less than Twelve Months		3,291
Gross Unrealized Loss, Total		(22)
Fair Value, Total		3,291
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Loss, Less than Twelve Months	(980)	(273)
Fair Value, Less than Twelve Months	19,385	10,742
Gross Unrealized Loss, Twelve Months or Greater	(223)	(246)
Fair Value, Twelve Months or Greater	1,728	1,069
Gross Unrealized Loss, Total	(1,203)	(519)
Fair Value, Total	$ 21,113	$ 11,811