Loss and Loss Adjustment Expenses - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Insurance [Abstract]
Loss and loss adjustment expense	$ 12,611	$ 2,490	$ 6,563	$ 3,100	$ 3,900	$ 2,300