Income Taxes - Summary of Deferred Taxes (Detail) $ in Thousands	Sep. 30, 2019 USD ($)
Deferred tax assets:
Reserves for expected costs of liquidation and Residual Wind-Down Claims and Costs	$ 18,474
Net operating and capital loss carryovers	52,085
Gross deferred tax assets	70,559
Less: Valuation allowance	(64,389)
Deferred tax asset, net of valuation allowance	6,170
Deferred tax liabilities:
Accrued investment income	(6,037)
Other asset	(133)
Gross deferred tax liabilities	(6,170)
Net deferred taxes	$ 0