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Stockholders' Equity - Common Share Repurchases and Issuances (Detail) - $ / shares
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Equity, Class of Treasury Stock [Line Items]        
Average purchase price per share $ 13.95 $ 14.51 $ 12.21 $ 18.50
Shares repurchased related to employee stock-based compensation plans 1,145,017 211,829 2,499,729 2,287,761
Average purchase price per share $ 14.20 $ 15.46 $ 12.36 $ 20.17
Common shares issued 1,558,455 563,109 4,525,047 4,781,517
Common Stock Shares Outstanding [Member]        
Equity, Class of Treasury Stock [Line Items]        
Common stock repurchased 14,347,974 12,075,388 47,137,636 41,919,908
Shares repurchased related to employee stock-based compensation plans 1,145,017 211,829 2,499,729 2,287,761
Common shares issued 1,558,455 563,109 4,525,047 4,781,517