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Stockholders' Equity - Additional Information (Detail) - USD ($)
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Class of Stock [Line Items]    
Common stock dividend paid $ 0.16 $ 0.16
Purchase price of common stock repurchased on open market $ 110,000,000 $ 200,000,000
Authorized share repurchased program remaining available amount $ 490,000,000  
Common Stock [Member]    
Class of Stock [Line Items]    
Closing price of common stock $ 14.76  
Common Stock Shares Outstanding [Member]    
Class of Stock [Line Items]    
Common shares repurchased 7,363,292 19,210,281