Insurance Activity - Summary of Losses and Loss Adjustment Reserve Activity (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016		Dec. 31, 2015
Liability For Unpaid Claims And Claims Adjustment Expense Net [Abstract]
Balance at beginning of period	$ 5,063	[1]	$ 18,947
Incurred or (released) - prior periods	387		(1,115)
Paid or terminated - prior periods	(3,180)		(12,769)
Total losses and loss adjustment reserves	$ 2,270		$ 5,063	[1]

[1] Balances derived from audited financial statements as of December 31, 2015.