Income Taxes - Summary of Deferred Taxes (Detail) $ in Thousands	Jun. 30, 2017 USD ($)
Deferred tax assets:
Reserves for expected costs of liquidation and Residual Wind-Down Claims and Costs	$ 7,645
Net operating and capital loss carryovers	61,836
Gross deferred tax assets	69,481
Less: Valuation allowance	(67,704)
Deferred tax asset, net of valuation allowance	1,777
Deferred tax liabilities:
Accrued investment income	(1,777)
Gross deferred tax liabilities	(1,777)
Net deferred taxes	$ 0