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Differences in Tax and Estimated Tax Provisions at Weighted Average Tax Rate (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Income Tax [Line Items] |  |  |  |
Expected tax provision at weighted average, Amount | $ (1,614) | $ (2,500) | $ 6,649 | $ (3,450)
Adjustments: |  |  |  |
Tax exempt interest, Amount | (120) | (248) | (490) | (804)
Dividend exclusion, Amount | (229) | (292) | (1,186) | (880)
Effective tax rate adjustment, Amount | 288 | 1,033 | 2,600 | 2,565
Other, Amount | 42 | 115 | 535 | 146
Effective income tax expense (benefit) | $ (1,633) | $ (1,892) | $ 8,108 | $ (2,423)
Expected tax provision at weighted average, % of Pre-Tax Income | (19.90%) | (49.50%) | 11.10% | (13.50%)
Adjustments: |  |  |  |
Tax exempt interest, % of Pre-Tax Income | (1.50%) | (4.90%) | (0.80%) | (3.10%)
Dividend exclusion, % of Pre-Tax Income | (2.80%) | (5.80%) | (2.00%) | (3.40%)
Effective tax rate adjustment, % of Pre-Tax Income | 3.50% | 20.40% | 4.30% | 10.00%
Other, % of Pre-Tax Income | 0.60% | 2.40% | 0.90% | 0.50%
Effective income tax expense (benefit), % of Pre-Tax Income | (20.10%) | (37.40%) | 13.50% | (9.50%)

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