Insurance Activity - Schedule of Premiums Assumed and Earned (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
Insurance [Abstract]
Premiums assumed	$ 1,564	$ 2,790	$ 5,276	$ 9,353
Change in unearned premiums	71	143	238	(1,281)
Premiums earned	$ 1,635	$ 2,933	$ 5,514	$ 8,072