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Preferred and Common Stockholder's Equity - Additional Information (Detail) - USD ($)
Dec. 31, 2015
Jun. 30, 2015
Feb. 28, 2015
Dec. 31, 2014
Jun. 30, 2014
Class of Stock [Line Items]          
Preferred stock, shares authorized 5,000,000        
Preferred stock, par value $ 0.01        
Preferred stock, shares outstanding 0        
Common stock, shares authorized 150,000,000        
Common stock, par value $ 0.01        
Common stock, shares issued 71,600,000 68,900,000   71,500,000 73,500,000
Common stock, shares outstanding 71,600,000 68,900,000   71,500,000 73,500,000
Share repurchase program, remaining authorized repurchase amount $ 91,600,000        
Seventh Share Repurchase Program          
Class of Stock [Line Items]          
Share repurchase program, authorized amount     $ 200,000,000