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Stock-Based Compensation - Summary of PSUs (Detail) - Performance Share Units [Member] - $ / shares
shares in Thousands
1 Months Ended 12 Months Ended
Feb. 29, 2016
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unvested, Units, beginning of year   1,762
Granted, Units   555
Vested, Units (1,093) (664)
Forfeited, Units   (148)
Unvested, Units, end of year   1,505
Unvested, Weighted Average Per Share Fair Value, beginning of year   $ 52.90
Granted, Weighted Average Per Share Fair Value   79.27
Vested, Weighted Average Per Share Fair Value   48.38
Forfeited, Weighted Average Per Share Fair Value   76.01
Unvested, Weighted Average Per Share Fair Value, end of year   $ 68.98