Income Taxes - Summary of Deferred Taxes (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Mar. 31, 2019
Deferred tax assets:
Reserves for expected costs of liquidation and Residual Wind-Down Claims and Costs	$ 6,989	$ 13,932
Net operating and capital loss carryovers	52,007	52,150
Gross deferred tax assets	58,996	66,082
Less: Valuation allowance	(58,701)	(54,740)
Deferred tax asset, net of valuation allowance	295	11,342
Deferred tax liabilities:
Accrued investment income	(295)	(11,342)
Gross deferred tax liabilities	(295)	(11,342)
Net deferred taxes	$ 0	$ 0