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Preferred and Common Stockholder's Equity - Additional Information (Detail) - USD ($)
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2013
Class of Stock [Line Items]        
Preferred stock, shares authorized 5,000,000      
Preferred stock, par value $ 0.01      
Preferred stock, shares outstanding 0 0 0  
Common stock, shares authorized 150,000,000      
Common stock, par value $ 0.01      
Common stock, shares issued 69,100,000 68,900,000 73,500,000 80,600,000
Common stock, shares outstanding 69,100,000 68,900,000 73,500,000 80,600,000
Share repurchase program, remaining authorized repurchase amount $ 192,300,000      
Eighth Share Repurchase Program        
Class of Stock [Line Items]        
Share repurchase program, authorized amount $ 200,000,000