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Employee Stock-based Compensation Plans - Restricted Stock and Restricted Stock Unit Activity (Detail)
shares in Thousands
12 Months Ended
Dec. 31, 2018
$ / shares
shares
Number of Shares  
Unvested shares at January 1, 2018 (in shares) | shares 4,226
Granted (in shares) | shares 994
Vested (in shares) | shares (1,636)
Forfeited/canceled (in shares) | shares (353)
Unvested shares at December 31, 2018 (in shares) | shares 3,231
Weighted- Average Grant Date Fair Value per Share  
Unvested shares at January 1, 2016 (in usd per share) | $ / shares $ 32.76
Granted (in usd per share) | $ / shares 37.98
Vested (in usd per share) | $ / shares 37.86
Forfeited/canceled (in usd per share) | $ / shares 34.44
Unvested shares at December 31, 2016 (in usd per share) | $ / shares $ 34.27