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Differences in Tax Provision for Financial Statement Purposes and Expected Tax Provision at Weighted Average Tax Rate (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Income Tax [Line Items]        
Expected tax provision at weighted average, Amount $ (5,580) $ (1,614) $ (9,595) $ 6,649
Adjustments:        
Tax exempt interest, Amount (107) (120) (326) (490)
Dividend exclusion, Amount (175) (229) (588) (1,186)
Effective tax rate adjustment, Amount   288   2,600
Other, Amount (119) 42 (373) 535
Actual tax on continuing operations $ (5,981) $ (1,633) $ (10,882) $ 8,108
Expected tax provision at weighted average rate, % of Pre-Tax Income (57.40%) (19.90%) (292.30%) 11.10%
Adjustments:        
Tax exempt interest, % of Pre-Tax Income (1.10%) (1.50%) (9.90%) (0.80%)
Dividend exclusion, % of Pre-Tax Income (1.80%) (2.80%) (17.90%) (2.00%)
Effective tax rate adjustment, % of Pre-Tax Income 0.00% 3.50% 0.00% 4.30%
Other, % of Pre-Tax Income (1.20%) 0.60% (11.40%) 0.90%
Actual tax on continuing operations, % of Pre-Tax Income (61.50%) (20.10%) (331.50%) 13.50%