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Quarterly Results for 2014 and 2013 - Summary of Quarterly Results for the Periods Presented (Detail) (USD $) In Thousands, except Per Share data, 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
Quarterly Financial Information Disclosure [Abstract]
Net premiums earned	$ 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
Investment income	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
Total 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
Total 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
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
Basic earnings per share	$ 0.63us-gaap_EarningsPerShareBasic	$ 0.64us-gaap_EarningsPerShareBasic	$ 0.50us-gaap_EarningsPerShareBasic	$ 0.41us-gaap_EarningsPerShareBasic	$ 0.46us-gaap_EarningsPerShareBasic	$ 0.43us-gaap_EarningsPerShareBasic	$ 0.47us-gaap_EarningsPerShareBasic	$ 0.30us-gaap_EarningsPerShareBasic	$ 2.17us-gaap_EarningsPerShareBasic	$ 1.64us-gaap_EarningsPerShareBasic	$ 0.76us-gaap_EarningsPerShareBasic
Diluted earnings per share	$ 0.59us-gaap_EarningsPerShareDiluted	$ 0.61us-gaap_EarningsPerShareDiluted	$ 0.49us-gaap_EarningsPerShareDiluted	$ 0.38us-gaap_EarningsPerShareDiluted	$ 0.44us-gaap_EarningsPerShareDiluted	$ 0.40us-gaap_EarningsPerShareDiluted	$ 0.44us-gaap_EarningsPerShareDiluted	$ 0.29us-gaap_EarningsPerShareDiluted	$ 2.08us-gaap_EarningsPerShareDiluted	$ 1.56us-gaap_EarningsPerShareDiluted	$ 0.75us-gaap_EarningsPerShareDiluted

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