Insurance Activity - Schedule of Premiums Assumed and Earned (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Insurance [Abstract]
Premiums assumed	$ 1,166	$ 1,564	$ 3,680	$ 5,276
Change in unearned premiums	81	71	258	238
Premiums earned	$ 1,247	$ 1,635	$ 3,938	$ 5,514