Income Taxes - Summary of Deferred Taxes (Detail) $ in Thousands	Jun. 30, 2020 USD ($)
Deferred tax assets:
Reserves for expected costs of liquidation and Residual Wind-Down Claims and Costs	$ 4,232
Net operating loss carryovers	52,787
Gross deferred tax assets	57,019
Less: Valuation allowance	(56,982)
Deferred tax asset, net of valuation allowance	37
Deferred tax liabilities:
Accrued investment income	(37)
Gross deferred tax liabilities	(37)
Net deferred taxes	$ 0