Insurance Activity - Summary of Losses and Loss Adjustment Reserve Activity (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Liability For Unpaid Claims And Claims Adjustment Expense Net [Abstract]
Balance at beginning of period	$ 18,947	$ 44,314
(Released) incurred - prior periods	(1,115)	3,281
Paid or terminated - prior periods	(12,769)	(28,648)
Total losses and loss adjustment reserves	$ 5,063	$ 18,947