Insurance Activity - Schedule of Premiums Assumed and Earned (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Insurance [Abstract]
Premiums assumed	$ 4,788	$ 6,869	$ 12,115
Change in unearned premiums	333	300	(1,169)
Premiums earned	$ 5,121	$ 7,169	$ 10,946