Reinsurance - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Number of reinsurers	27		27
Reinsurance recoverable	$ 0		$ 0
Credit risk associated with reinsurance receivables	0		0
Other assets	19,101		15,814
Prepaid reinsurance premiums	15,217		28,066
Credit Concentration Risk [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Recoveries pertaining to reinsurance contracts	0	0
Reinsurance [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Net reduction in ceded premiums	5,484	0
Other assets	13,081		9,009
Prepaid reinsurance premiums	$ 4,924		$ 3,512