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Investments - Summary of Securities with Gross Unrealized Loss Positions Aggregated by Investment Category (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Schedule of Available-for-sale Securities [Line Items]  
Gross Unrealized Loss, Less than Twelve Months $ (557)
Fair Value, Less than Twelve Months 14,149
Gross Unrealized Loss, Twelve Months or Greater (59)
Fair Value, Twelve Months or Greater 181
Gross Unrealized Loss, Total (616)
Fair Value, Total 14,330
Fixed-Maturity Securities [Member]
  
Schedule of Available-for-sale Securities [Line Items]  
Gross Unrealized Loss, Less than Twelve Months (229)
Fair Value, Less than Twelve Months 7,883
Gross Unrealized Loss, Total (229)
Fair Value, Total 7,883
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 (3)
Fair Value, Less than Twelve Months 510
Gross Unrealized Loss, Total (3)
Fair Value, Total 510
Fixed-Maturity Securities [Member] | Corporate Bonds [Member]
  
Schedule of Available-for-sale Securities [Line Items]  
Gross Unrealized Loss, Less than Twelve Months (86)
Fair Value, Less than Twelve Months 3,656
Gross Unrealized Loss, Total (86)
Fair Value, Total 3,656
Fixed-Maturity Securities [Member] | Commercial Mortgage-Backed Securities [Member]
  
Schedule of Available-for-sale Securities [Line Items]  
Gross Unrealized Loss, Less than Twelve Months (82)
Fair Value, Less than Twelve Months 1,949
Gross Unrealized Loss, Total (82)
Fair Value, Total 1,949
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 (56)
Fair Value, Less than Twelve Months 1,571
Gross Unrealized Loss, Total (56)
Fair Value, Total 1,571
Fixed-Maturity Securities [Member] | Redeemable Preferred Stock [Member]
  
Schedule of Available-for-sale Securities [Line Items]  
Gross Unrealized Loss, Less than Twelve Months (2)
Fair Value, Less than Twelve Months 197
Gross Unrealized Loss, Total (2)
Fair Value, Total 197
Equity Securities [Member]
  
Schedule of Available-for-sale Securities [Line Items]  
Gross Unrealized Loss, Less than Twelve Months (328)
Fair Value, Less than Twelve Months 6,266
Gross Unrealized Loss, Twelve Months or Greater (59)
Fair Value, Twelve Months or Greater 181
Gross Unrealized Loss, Total (387)
Fair Value, Total $ 6,447