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Other Comprehensive Income (Loss) - Reclassifications Out of Accumulated Other Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net realized gains (losses) on investments	$ 171	$ 902
NET INCOME	22,330us-gaap_NetIncomeLoss	13,549us-gaap_NetIncomeLoss
Accumulated Net Unrealized Investment Gain (Loss) [Member] \| Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net realized gains (losses) on investments	171	902
Income taxes, current	(65)	(348)
NET INCOME	$ 106	$ 554

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.