Earnings Per Share - Additional Information (Detail) - shares	Jun. 30, 2015	Mar. 31, 2015	May. 31, 2008
Equity, Class of Treasury Stock [Line Items]
Common stock shares authorized for repurchase			2,000,000
Shares remain authorized for repurchase	1,898,347
2015 Plan [Member] | Maximum [Member]
Equity, Class of Treasury Stock [Line Items]
Common stock shares authorized for repurchase		987,790