Liquidating Distributions - Schedule of Liquidating Distributions (Net Reversal of Liquidating Distributions) (Detail) - Liquidation Basis of Accounting [Member] - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Distribution Made to Limited Liability Company (LLC) Member [Line Items]
Distributions during the year	$ 433	$ 112,382	$ 130,248
Less: Liquidating distributions payable as of beginning of year	(9,205)	(6,213)	(7,714)
Add: Liquidating distributions payable as of end of year	1,825	9,205	6,213
Total	$ (6,947)	$ 115,374	$ 128,747