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Stockholders' Equity - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Class of Stock [Line Items]            
Common stock dividend paid $ 0.16 $ 0.16 $ 0.16 $ 0.16 $ 0.48 $ 0.48
Purchase price of common stock repurchased on open market $ 200,000,000     $ 175,000,000 $ 575,000,000 $ 775,000,000
Authorized share repurchased program remaining available amount $ 180,000,000       $ 180,000,000  
Common Stock [Member]            
Class of Stock [Line Items]            
Closing price of common stock $ 14.47       $ 14.47  
Common Stock Shares Outstanding [Member]            
Class of Stock [Line Items]            
Common shares repurchased 14,347,974     12,075,388 47,137,636 41,919,908