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Schedule II - Condensed Financial Information of Registrant - Condensed Statements of 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
PREMIUMS EARNED AND OTHER REVENUES
Premiums earned, net	$ 95,420us-gaap_PremiumsEarnedNet	$ 94,288us-gaap_PremiumsEarnedNet	$ 73,362us-gaap_PremiumsEarnedNet	$ 63,807us-gaap_PremiumsEarnedNet	$ 66,452us-gaap_PremiumsEarnedNet	$ 68,927us-gaap_PremiumsEarnedNet	$ 66,867us-gaap_PremiumsEarnedNet	$ 65,409us-gaap_PremiumsEarnedNet	$ 326,877us-gaap_PremiumsEarnedNet	$ 267,655us-gaap_PremiumsEarnedNet	$ 231,120us-gaap_PremiumsEarnedNet
Net investment income (expense)	801us-gaap_NetInvestmentIncome	644us-gaap_NetInvestmentIncome	412us-gaap_NetInvestmentIncome	518us-gaap_NetInvestmentIncome	1,397us-gaap_NetInvestmentIncome	382us-gaap_NetInvestmentIncome	137us-gaap_NetInvestmentIncome	12us-gaap_NetInvestmentIncome	2,375us-gaap_NetInvestmentIncome	1,928us-gaap_NetInvestmentIncome	441us-gaap_NetInvestmentIncome
Net realized gains (losses) on investments									5,627	(14,740)	(11,943)
Net change in unrealized gains (losses) on investments										7,850	9,443
Total premiums earned and other revenues	104,482us-gaap_Revenues	103,500us-gaap_Revenues	86,989us-gaap_Revenues	74,305us-gaap_Revenues	77,580us-gaap_Revenues	78,368us-gaap_Revenues	77,756us-gaap_Revenues	67,455us-gaap_Revenues	369,276us-gaap_Revenues	301,159us-gaap_Revenues	269,939us-gaap_Revenues
OPERATING COSTS AND EXPENSES
General and administrative expenses									118,397	91,988	91,193
Total operating costs and expenses	67,556us-gaap_BenefitsLossesAndExpenses	66,348us-gaap_BenefitsLossesAndExpenses	56,580us-gaap_BenefitsLossesAndExpenses	51,188us-gaap_BenefitsLossesAndExpenses	51,587us-gaap_BenefitsLossesAndExpenses	53,255us-gaap_BenefitsLossesAndExpenses	48,068us-gaap_BenefitsLossesAndExpenses	47,693us-gaap_BenefitsLossesAndExpenses	241,672us-gaap_BenefitsLossesAndExpenses	200,603us-gaap_BenefitsLossesAndExpenses	217,380us-gaap_BenefitsLossesAndExpenses
INCOME BEFORE INCOME TAXES									127,604	100,556	52,559
Benefit from income taxes									54,616us-gaap_IncomeTaxExpenseBenefit	41,579us-gaap_IncomeTaxExpenseBenefit	22,247us-gaap_IncomeTaxExpenseBenefit
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
Parent Company [Member]
PREMIUMS EARNED AND OTHER REVENUES
Assumed premiums written											10,686
Premiums earned, net											10,686
Net investment income (expense)									(23)	207	25
Net realized gains (losses) on investments									625	(2,947)	(1,880)
Net change in unrealized gains (losses) on investments										1,625	1,162
Management fee									121	134	142
Total premiums earned and other revenues									723	(981)	10,135
OPERATING COSTS AND EXPENSES
General and administrative expenses									39,062	32,476	25,051
Total operating costs and expenses									39,062	32,476	25,051
INCOME BEFORE INCOME TAXES									(38,339)	(33,457)	(14,916)
Benefit from income taxes									(16,403)	(13,834)	(6,312)
LOSS BEFORE EQUITY IN NET EARNINGS OF SUBSIDIARIES									(21,936)	(19,623)	(8,604)
Equity in net income of subsidiaries									94,924	78,600	38,916
NET INCOME									$ 72,988	$ 58,977	$ 30,312