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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								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net realized gains (losses) on investments									$ 5,627	$ (14,740)	$ (11,943)
Income taxes, current									(53,498)us-gaap_CurrentIncomeTaxExpenseBenefit	(34,216)us-gaap_CurrentIncomeTaxExpenseBenefit	(18,434)us-gaap_CurrentIncomeTaxExpenseBenefit
NET INCOME	20,972us-gaap_NetIncomeLoss	21,341us-gaap_NetIncomeLoss	17,126us-gaap_NetIncomeLoss	13,549us-gaap_NetIncomeLoss	15,582us-gaap_NetIncomeLoss	14,407us-gaap_NetIncomeLoss	17,029us-gaap_NetIncomeLoss	11,959us-gaap_NetIncomeLoss	72,988us-gaap_NetIncomeLoss	58,977us-gaap_NetIncomeLoss	30,312us-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									5,627	1,297
Income taxes, current									(2,171)	(500)
NET INCOME									$ 3,456	$ 797

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.