Income Taxes - Summary of Deferred Taxes (Detail) $ in Thousands	Dec. 31, 2018 USD ($)
Deferred tax assets:
Reserves for expected costs of liquidation and Residual Wind-Down Claims and Costs	$ 15,069
Net operating and capital loss carryovers	52,086
Gross deferred tax assets	67,155
Less: Valuation allowance	(54,393)
Deferred tax asset, net of valuation allowance	12,762
Deferred tax liabilities:
Accrued investment income	(12,629)
Other asset	(133)
Gross deferred tax liabilities	(12,762)
Net deferred taxes	$ 0