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Other Comprehensive Income (Loss) - Reclassifications Out of Accumulated Other Comprehensive Income (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]                      
Net realized gains (losses) on investments                 $ (14,740) $ (11,943) $ 2,350
Tax (expense) or benefit                 (41,579) (22,247) (13,609)
Net Income 15,582 14,407 17,029 11,959 4,406 8,256 7,777 9,873 58,977 30,312 20,109
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
                      
Accumulated Other Comprehensive Income (Loss) [Line Items]                      
Net realized gains (losses) on investments                 1,297    
Tax (expense) or benefit                 (500)    
Net Income                 $ 797