Summary of Significant Accounting Policies (Details Textual) (USD $)	12 Months Ended			12 Months Ended									12 Months Ended
	Dec. 31, 2012 Vote	Jul. 02, 2012	Dec. 31, 2011	Dec. 31, 2012 Maximum [Member]	Dec. 31, 2012 Minimum [Member]	Dec. 31, 2012 Bluestone [Member]	Jul. 02, 2012 Bluestone [Member]	Dec. 31, 2012 Bermuda Insurance Companies [Member]	Dec. 31, 2012 Insurance holding company [Member]	Dec. 31, 2012 American Safety UK Limited [Member]	Dec. 31, 2012 American safety casualty [Member]	Dec. 31, 2012 American safety holdings [Member]	Dec. 31, 2012 Stock option [Member]	Dec. 31, 2011 Stock option [Member]	Dec. 31, 2010 Stock option [Member]
Summary of Significant Accounting Policies [Line Items]
Percentage of ownership						100.00%		100.00%	100.00%	100.00%	78.00%	22.00%
Fair value measurement intangible assets	$ 9,000,000
Estimated useful life of intangible assets	10 years
Amortization expense recorded	500,000
Vesting period				5 years	3 years
Share-based compensation expense													325,000	577,000	636,000
Purchase price valuation							18,000,000
Summary of Significant Accounting Policies (Textual) [Abstract]
Authorized share capital	35,000,000
Common shares	30,000,000		30,000,000
Common shares par value	$ 0.01		$ 0.01
Preferred shares	5,000,000		5,000,000
Preferred shares par value	$ 0.01		$ 0.01
Company's shareholders voting limitation	9.50%
Number of vote per share	1
Percentage of outstanding shares required for approval	66.66%
Minimum percentage of issued and outstanding controlled common shares for restriction of voting rights	9.50%
Percentage of voting rights to other than controlled shareholders	9.50%
Limitation of voting rights with respect to Controlled Shares	9.50%
Recoverable allowance	4,700,000		5,000,000
Goodwill	20,843,000		9,317,000
Term of options outstanding	P10Y
Restricted deposits	75,000		75,000
Terminated swaps resulting in cash proceeds	2,100,000
Unrecognized gain	1,213,000		1,266,000
Percentage of capital stock acquired		100.00%
Purchase price of capital stock		20,000,000
Estimated Earnout Consideration Included in Total Consideration		6,000,000
Low limit transactional commercial surety premium		16,000,000
Fair value measurement earnout provision		4,000,000
Cash paid on acquisition		$ 14,000,000