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Comprehensive Income and Accumulated Other Comprehensive Income - Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Equity [Abstract]      
Unrealized gain (loss) on available-for-sale securities, Pre-tax Amount $ (2,572) $ 10,133 $ (11,724)
Change in unrealized losses on available-for-sale securities with OTTI, Pre-Tax Amount 176   222
Less amortization of differences between fair value and amortized cost for fixed maturity security transfer, Pre-tax Amount (40) (44) (75)
Less reclassification adjustment for gains realized in net income, Pre-Tax Amount 2,093 842 386
Net unrealized gain loss, Pre-Tax Amount (343) 10,931 (11,191)
Other comprehensive income, Pre-Tax Amount (343) 10,931 (11,191)
Unrealized gain loss on available-for-sale securities, Tax Expense (900) 3,546 (4,104)
Change in unrealized losses on available-for-sale securities with OTTI, Tax Expense 62   78
Less amortization of differences between fair value and amortized cost for fixed maturity security transfer, Tax Expense (14) (15) (26)
Less reclassification adjustment for gains realized in net income, Tax Expense 732 295 135
Net unrealized gain loss, Tax Expense (120) 3,826 (3,917)
Other comprehensive income, Tax Expense (120) 3,826 (3,917)
Unrealized gain (loss) on available-for-sale securities, Net-of-Tax Amount (1,672) 6,587 (7,620)
Change in unrealized losses on available-for-sale securities with OTTI, Net-of-Tax Amount 114   144
Less amortization of differences between fair value and amortized cost for fixed maturity security transfer, Net-of-Tax Amount (26) (29) (49)
Reclassification adjustment for gains realized in net income, Net-of-Tax Amount 1,361 547 251
Net unrealized gain loss, Net-of-Tax Amount (223) 7,105 (7,274)
Other comprehensive income, Net-of-Tax Amount $ (223) $ 7,105 $ (7,274)