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Schedule of Accumulated Other Comprehensive Income, Net of Tax (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Jun. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]            
Deferred taxes $ (10,904)   $ (25,480)      
Accumulated other comprehensive income, net of tax 24,954 34,001 54,028 54,456 47,574 53,350
Fixed Maturities
           
Schedule of Available-for-sale Securities [Line Items]            
Net unrealized gains 11,781   16,679      
Common Shares
           
Schedule of Available-for-sale Securities [Line Items]            
Net unrealized gains 24,652   62,645      
Other
           
Schedule of Available-for-sale Securities [Line Items]            
Net unrealized gains $ (575)   $ 184