Relationships with Mutual Insurance Companies (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2012
ORCC [Member]
Relationships with Mutual Insurance Companies [Line Items]
Number of Company Employee Board Members		9
Number of Board of Director Members		9
Capitol [Member]
Relationships with Mutual Insurance Companies [Line Items]
Number of Company Employee Board Members		5
Number of Board of Director Members		5
ORCC [Member] | Trinity [Member]
Relationships with Mutual Insurance Companies [Line Items]
Assumed Premiums Earned, Other Insurance Percentage		100.00%
Capitol [Member] | Trinity [Member]
Relationships with Mutual Insurance Companies [Line Items]
Assumed Premiums Earned, Other Insurance Percentage		100.00%
Change in Policyholder Benefits and Incurred Losses and LAE as Result of Quota Share Revision	$ (2.6)