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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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