Income Taxes - Summary of Deferred Taxes (Detail) $ in Thousands	Dec. 31, 2019 USD ($)
Deferred tax assets:
Reserves for expected costs of liquidation and Residual Wind-Down Claims and Costs	$ 18,217
Net operating and capital loss carryovers	52,218
Gross deferred tax assets	70,435
Less: Valuation allowance	(65,071)
Deferred tax asset, net of valuation allowance	5,364
Deferred tax liabilities:
Accrued investment income	(5,364)
Gross deferred tax liabilities	(5,364)
Net deferred taxes	$ 0