Stockholders' Equity Repurchases of Common Shares (Detail) - USD ($)		12 Months Ended
		Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Stock repurchased and retired during period, value		$ (11,653,000)	$ (19,371,000)	$ (489,000)
Stock repurchased and retired at end of period, shares		3,880,350	2,488,215
Stock repurchased and retired at end of period, weighted average price per share		$ 7.83	$ 7.38
Stock repurchased and retired at end of period, value		$ 30,364,722	$ 19,200,393
February 2015
Stock repurchased and retired during period, shares		1,392,135	2,488,215
Stock repurchased and retired during period, value	[1]	$ 11,164,329	$ 19,200,393
Stock repurchased, weighted average price per share		$ 8.02	$ 7.38
Stock repurchase program, authorized amount		$ 20,000,000
Stock repurchase program expiration date		Oct. 20, 2016	Feb. 29, 2016
October 2015
Stock repurchase program, authorized amount		$ 15,000,000
Total Plan 2015
Stock repurchase program, remaining authorized repurchase amount		$ 15,000,000

[1] Amount excludes commission fees.