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Non-vested Restricted Stock Units (Detail) - Restricted Stock Units
12 Months Ended
Dec. 31, 2019
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Shares, Beginning Balance | shares 2,328,857
Shares, Granted | shares 2,368,732
Shares, Forfeited | shares (579,612)
Shares, Vested | shares (969,595)
Shares, Cancelled | shares (52,357)
Shares, Ending Balance | shares 3,096,025
Weighted-Average Grant Date Fair Value, Beginning Balance | $ / shares $ 67.33
Weighted-Average Grant Date Fair Value, Granted | $ / shares 69.82
Weighted-Average Grant Date Fair Value, Forfeited | $ / shares 70.30
Weighted-Average Grant Date Fair Value, Vested | $ / shares 60.96
Weighted-Average Grant Date Fair Value, Cancelled | $ / shares 85.39
Weighted-Average Grant Date Fair Value, Ending Balance | $ / shares $ 70.62