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Schedule of Share Based Compensation Total Shares Available (Detail) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award      
Available for grant at January 1 8,605 9,546 10,914
Options granted (69) (111) (130)
Restricted stock units awarded (790) (939) (1,471)
Restricted stock units forfeited 128 109 233
Available for grant at December 31 7,874 8,605 9,546