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Schedule of Share Based Compensation Total Shares Available (Detail) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award      
Available for grant at January 1 10,914 12,443 14,213
Options granted (130) (132) (89)
Restricted stock units awarded (1,471) (1,681) (1,870)
Restricted stock units forfeited 233 284 189
Available for grant at December 31 9,546 10,914 12,443