Income Taxes - Summary of Deferred Taxes (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017
Deferred tax assets:
Reserves for expected costs of liquidation and Residual Wind-Down Claims and Costs	$ 14,155	$ 7,868
Net operating and capital loss carryovers	52,217	60,747
Gross deferred tax assets	66,372	68,615
Less: Valuation allowance	(60,179)	(67,286)
Deferred tax asset, net of valuation allowance	6,193	1,329
Deferred tax liabilities:
Accrued investment income	(6,193)	(1,329)
Gross deferred tax liabilities	(6,193)	(1,329)
Net deferred taxes	$ 0	$ 0