Related Party Transactions - NGHC (Details) - USD ($)			3 Months Ended
	May 01, 2015	Mar. 01, 2010	Mar. 31, 2018	Mar. 31, 2017
Related Party Transaction [Line Items]
Premiums earned			$ 685,432,000	$ 709,484,000
National General Holdings Corp. | NGHC Quota Share [Member]
Related Party Transaction [Line Items]
Percent participation in quota share by subsidiary		50.00%
Percentage of net premiums received on personal lines automobile business		25.00%
Percent of net losses related to premiums of personal lines business assumed by reinsurers		25.00%
National General Holdings Corp. | NGHC Subsidiaries Reinsurance Agreement [Member]
Related Party Transaction [Line Items]
Premiums earned			$ 98,000	$ 121,000
National General Holdings Corp. | NGHC Subsidiaries Reinsurance Agreement [Member] | Medical Excess of Loss Reinsurance Agreement [Member]
Related Party Transaction [Line Items]
Reinsurance coverage threshold	$ 1,000,000
Reinsurance coverage limit	4,000,000
Maximum limit of liability	2,000,000
National General Holdings Corp. | NGHC Subsidiaries Reinsurance Agreement [Member] | Layer 1 [Member] | Medical Excess of Loss Reinsurance Agreement [Member]
Related Party Transaction [Line Items]
Reinsurance coverage threshold	1,000,000
Reinsurance coverage limit	1,000,000
National General Holdings Corp. | NGHC Subsidiaries Reinsurance Agreement [Member] | Layer 2 [Member] | Medical Excess of Loss Reinsurance Agreement [Member]
Related Party Transaction [Line Items]
Reinsurance coverage threshold	2,000,000
Reinsurance coverage limit	3,000,000
National General Holdings Corp. | NGHC Subsidiaries Reinsurance Agreement [Member] | Layer 3 [Member] | Medical Excess of Loss Reinsurance Agreement [Member]
Related Party Transaction [Line Items]
Reinsurance coverage threshold	5,000,000
Reinsurance coverage limit	$ 5,000,000