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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Income Tax [Line Items] |  |  |  |
Expected tax provision at weighted average, Amount | $ (848) | $ 9,925 | $ (4,015) | $ 8,263
Adjustments: |  |  |  |
Tax exempt interest, Amount | (83) | (155) | (219) | (370)
Dividend exclusion, Amount | (258) | (479) | (413) | (957)
Effective tax rate adjustment, Amount |  | 1,811 |  | 2,312
Other, Amount | (156) | 488 | (254) | 493
Total income tax expense (benefit) | $ (1,345) | $ 11,590 | $ (4,901) | $ 9,741
Expected tax provision at weighted average rate, % of Pre-Tax Income | (8.70%) | 22.20% | (30.90%) | 16.00%
Adjustments: |  |  |  |
Tax exempt interest, % of Pre-Tax Income | (0.80%) | (0.30%) | (1.70%) | (0.70%)
Dividend exclusion, % of Pre-Tax Income | (2.60%) | (1.10%) | (3.20%) | (1.90%)
Effective tax rate adjustment, % of Pre-Tax Income |  | 4.00% |  | 4.50%
Other, % of Pre-Tax Income | (1.60%) | 1.10% | (2.00%) | 0.90%
Actual tax on continuing operations, % of Pre-Tax Income | (13.70%) | 25.90% | (37.80%) | 18.80%

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