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Schedule of Accumulated Other Comprehensive Income, Net of Tax (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]            
Deferred taxes $ (4,827)   $ (10,263)      
Accumulated other comprehensive income, net of tax 13,245 $ 20,102 23,384 $ 24,954 $ 34,001 $ 54,028
Fixed Maturities            
Schedule of Available-for-sale Securities [Line Items]            
Net unrealized gains 9,693   10,527      
Common Shares            
Schedule of Available-for-sale Securities [Line Items]            
Net unrealized gains 7,409   22,751      
Other            
Schedule of Available-for-sale Securities [Line Items]            
Net unrealized gains $ 970   $ 369