Subsequent Events (Details) (Monarch Delaware Holdings LLC [Member], USD $)	3 Months Ended
	Mar. 31, 2015 Manager
Subsequent Event [Line Items]
Ownership interest in Monarch Parent's equity (in hundredths)	42.40%
Capital contribution for voting interests	$ 14,000,000
Number of board of managers	7
Number of board of managers designated by entity	3
Number of board of managers jointly selected by entity and co-venturer	1
Period prior to date of termination the entity will be entitled to receive termination fees	12 months
Period within which to identify seventh member of Board of Managers	6 months
Period from the closing date during which the Company and Crosswinds are allowed to participate in certain other transactions	24 months
C.A. Bancorp Inc. [Member]
Subsequent Event [Line Items]
Ownership interest in Monarch Parent's equity (in hundredths)	42.40%
Capital contribution for voting interests	14,000,000
Percentage of assets under management payable as management fee for range one (in hundredths)	0.75%
Maximum threshold limit of assets for range one	100,000,000
Percentage of assets under management payable as management fee for range two (in hundredths)	0.50%
Minimum threshold limit of assets for range two	100,000,000
Maximum threshold limit of assets for range two	200,000,000
Percentage of assets under management payable as management fee for range three (in hundredths)	0.30%
Minimum threshold limit of assets for range three	200,000,000
Number of board of managers designated by entity	3
Transatlantic Reinsurance Company [Member]
Subsequent Event [Line Items]
Ownership interest in Monarch Parent's equity (in hundredths)	15.20%
Capital contribution for voting interests	5,000,000
Maximum percentage of reinsurance coverage obtained in any individual reinsurance contract (in hundredths)	15.00%
Transatlantic Reinsurance Company [Member] | Senior Debt [Member]
Subsequent Event [Line Items]
Long-term debt	5,000,000
Interest rate percentage (in hundredths)	6.00%
Maturity period of debt	6 years
Federated National Underwriters, Inc. [Member]
Subsequent Event [Line Items]
Percentage of written annual premium payable to agents for managing general agent services (in hundredths)	4.00%
Percentage of earned annual premium payable for claims administration services (in hundredths)	3.60%
Administrative fee per-policy underwritten	$ 25