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Stockholders' Equity - Additional Information (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Class of Stock [Line Items]          
Common stock dividend paid $ 0.16 $ 0.16 $ 0.16 $ 0.32 $ 0.32
Purchase price of common stock repurchased on open market $ 175,000,000   $ 300,000,000 $ 375,000,000 $ 600,000,000
Authorized share repurchased program remaining available amount $ 380,000,000     $ 380,000,000  
Common Stock [Member]          
Class of Stock [Line Items]          
Closing price of common stock $ 11.95     $ 11.95  
Common Stock Shares Outstanding [Member]          
Class of Stock [Line Items]          
Common shares repurchased 13,579,381   15,190,685 32,789,662 29,844,520