Repurchases of Common Shares (Detail) - USD ($)		3 Months Ended		6 Months Ended
		Sep. 30, 2015	Jun. 30, 2015	Sep. 30, 2015
Number of Shares		1,326,294	574,467	1,900,761
Weighted Average Repurchase Price Per Share		$ 8.01	$ 7.38	$ 7.82
Amount	[1]	$ 10,619,707	$ 4,239,216	$ 14,858,923

[1] Amount excludes commission fees.