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Schedule of Unrealized Net Capital Gains and Losses (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Fair value    
Fixed income securities $ 330,559 $ 333,640
Short-term investments 24,203 12,974
Gross unrealized Gains    
Fixed income securities 21,264 21,481
Short-term investments 1  
Gross unrealized Losses    
Fixed income securities (29) (626)
Short-term investments      
Unrealized net gains (losses)    
Fixed income securities 21,235 20,855
Short-term investments 1  
Unrealized net capital gains and losses, pre-tax 21,236 20,855
Deferred income taxes (7,433) (7,299)
Unrealized net capital gains and losses, after-tax $ 13,803 $ 13,556