Liquidating Distributions - Schedule of Liquidating Distributions (Detail) - Liquidation Basis of Accounting [Member] - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Distribution Made to Limited Liability Company (LLC) Member [Line Items]
Distributions during the year	$ 40	$ 433	$ 112,382
Less: Liquidating distributions payable as of beginning of year	(1,825)	(9,205)	(6,213)
Add: Liquidating distributions payable as of end of year	1,785	1,825	9,205
Total	$ 0	$ (6,947)	$ 115,374