Subsequent Events - Additional Information (Detail) - shares	Aug. 10, 2015	Jun. 30, 2015	Apr. 20, 2015	Nov. 13, 2014
Subsequent Event [Line Items]
Share repurchase program, shares repurchased		380,085		926,000
Subsequent Event [Member]
Subsequent Event [Line Items]
Share repurchase program, shares repurchased	2,726,000
Board of Directors [Member]
Subsequent Event [Line Items]
Share repurchase program, shares repurchased			500,000
Board of Directors [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Share repurchase program, shares repurchased	1,300,000