Insurance Activity - Components of Liability for Losses and Loss Adjustment Reserves (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015		Dec. 31, 2014
Effects of Reinsurance [Line Items]
Total losses and loss adjustment reserves	$ 2,270	$ 5,063	[1]	$ 18,947
Case-basis reserves [Member]
Effects of Reinsurance [Line Items]
Total losses and loss adjustment reserves	1,047	4,193
IBNR reserves [Member]
Effects of Reinsurance [Line Items]
Total losses and loss adjustment reserves	4	75
Premium deficiency reserves [Member]
Effects of Reinsurance [Line Items]
Total losses and loss adjustment reserves	$ 1,219	$ 795

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