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Schedule of Stock Compensation Plan Activity (Detail) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award      
Awarded 1,681 1,870 2,110
Forfeited (284) (189) (122)
Outstanding at January 1 1,507 2,706 3,841
Granted 132 89 213
Exercised (518) (1,248) (1,220)
Forfeited   (38) (104)
Expired   (2) (24)
Outstanding at December 31 1,121 1,507 2,706
Vested and expected to vest at December 31 1,121 1,507 2,694
Exercisable at December 31 779 1,089 1,814
Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award      
Non-vested at January 1 4,352 4,636 4,970
Awarded 1,681 1,870 2,110
Vested (1,679) (1,965) (2,322)
Forfeited (284) (189) (122)
Non-vested at December 31 4,070 4,352 4,636