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Variable Interest Entities - Additional Information (Detail) (USD $)	9 Months Ended	1 Months Ended		12 Months Ended
	Sep. 30, 2012	Aug. 31, 2012 Amerisafe Capital Trust II [Member]	May 31, 2012 Amerisafe Capital Trust II [Member]	Dec. 31, 2004 Amerisafe Capital Trust II [Member]
Marketable Securities [Line Items]
Proceeds from issuance of trust preferred securities				$ 25,000,000
Purchase of subordinated debt securities				25,800,000
Redemption of debt securities	25,780,000	12,900,000	12,900,000
Subordinated debt securities			$ 12,900,000	$ 25,800,000

Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets.

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