Income Taxes - Summary of Deferred Taxes (Detail) $ in Thousands	Jun. 30, 2018 USD ($)
Deferred tax assets:
Reserves for expected costs of liquidation and Residual Wind-Down Claims and Costs	$ 11,289
Net operating and capital loss carryovers	52,644
Gross deferred tax assets	63,933
Less: Valuation allowance	(59,369)
Deferred tax asset, net of valuation allowance	4,564
Deferred tax liabilities:
Accrued investment income	(4,564)
Gross deferred tax liabilities	(4,564)
Net deferred taxes	$ 0