Income Taxes - Summary of Deferred Taxes (Detail) $ in Thousands	Jun. 30, 2019 USD ($)
Deferred tax assets:
Reserves for expected costs of liquidation and Residual Wind-Down Claims and Costs	$ 11,546
Net operating and capital loss carryovers	51,938
Gross deferred tax assets	63,484
Less: Valuation allowance	(59,084)
Deferred tax asset, net of valuation allowance	4,400
Deferred tax liabilities:
Accrued investment income	(4,267)
Other asset	(133)
Gross deferred tax liabilities	(4,400)
Net deferred taxes	$ 0