Income Taxes - Summary of Deferred Taxes (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016
Deferred tax assets:
Reserves for expected costs of liquidation and Residual Wind-Down Claims and Costs	$ 7,868	$ 9,421
Net operating and capital loss carryovers	60,747	112,442
Gross deferred tax assets	68,615	121,863
Less: Valuation allowance	(67,286)	(121,486)
Deferred tax asset, net of valuation allowance	1,329	377
Deferred tax liabilities:
Accrued investment income	(1,329)	(377)
Gross deferred tax liabilities	(1,329)	(377)
Net deferred taxes	$ 0	$ 0