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Stockholders' Equity - Common Share Repurchases and Issuances (Detail) - $ / shares
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Equity, Class of Treasury Stock [Line Items]        
Average purchase price per share $ 12.90 $ 19.76 $ 11.45 $ 20.12
Shares repurchased related to employee stock-based compensation plans 368,439 431,168 1,354,712 2,075,932
Average purchase price per share $ 13.05 $ 19.83 $ 10.80 $ 20.65
Common shares issued 467,007 633,170 2,966,592 4,218,408
Common Stock Shares Outstanding [Member]        
Equity, Class of Treasury Stock [Line Items]        
Common stock repurchased 13,579,381 15,190,685 32,789,662 29,844,520
Shares repurchased related to employee stock-based compensation plans 368,439 431,168 1,354,712 2,075,932
Common shares issued 467,007 633,170 2,966,592 4,218,408