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Effect of Reinsurance on Premiums Written and Earned (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Net premiums written	$ 146,005	$ 76,372	$ 272,109	$ 149,233
Net premiums earned	128,877	$ 66,017	256,214	$ 133,561
American Reliable Insurance Company
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Direct business	64,319		114,155
Reinsurance assumed	24,685		48,060
Reinsurance ceded	(16,177)		(28,732)
Net premiums written	72,827		133,483
Direct business	64,033		125,026
Reinsurance assumed	23,494		47,193
Reinsurance ceded	(21,609)		(42,879)
Net premiums earned	$ 65,918		$ 129,340

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