Losses and Loss Adjustment Expenses - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Reserves For Losses And Loss Adjustment Expenses [Line Items]
Unpaid claims and claim adjustment expenses overall development	$ (348)	$ 362	$ 266	$ 2,438
Unfavorable Development [Member]
Reserves For Losses And Loss Adjustment Expenses [Line Items]
Unpaid claims and claim adjustment expenses overall development	$ (348)