Income Taxes - Summary of Deferred Taxes (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018
Deferred tax assets:
Reserves for expected costs of liquidation and Residual Wind-Down Claims and Costs	$ 13,932	$ 14,155
Net operating and capital loss carryovers	52,150	52,217
Gross deferred tax assets	66,082	66,372
Less: Valuation allowance	(54,740)	(60,179)
Deferred tax asset, net of valuation allowance	11,342	6,193
Deferred tax liabilities:
Accrued investment income	(11,342)	(6,193)
Gross deferred tax liabilities	(11,342)	(6,193)
Net deferred taxes	$ 0	$ 0