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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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