Stock-based Compensation Plans - TSR - PSUs Activities (Detail) - Performance Based TSR - PSUs |
9 Months Ended | |||||
---|---|---|---|---|---|---|
Sep. 30, 2018
$ / shares
shares
| ||||||
Summary of Performance Share Unit Awards outstanding, Number of Units | ||||||
Outstanding, Beginning Balance | shares | 1,009,842 | |||||
Granted | shares | 329,486 | [1] | ||||
Vested and issued | shares | (73,985) | [2] | ||||
Forfeited | shares | (197,457) | |||||
Outstanding, Ending Balance | shares | 1,067,886 | |||||
Summary of Performance Share Unit Awards outstanding, Weighted Average Grant Date Fair Value | ||||||
Outstanding, Beginning Balance, weighted average grant date fair value | $ / shares | $ 38.38 | |||||
Granted, weighted average grant date fair value | $ / shares | 18.51 | [1] | ||||
Vested, weighted average grant date fair value | $ / shares | 56.81 | [2] | ||||
Forfeited, weighted average grant date fair value | $ / shares | 55.46 | |||||
Outstanding, Ending Balance, weighted average grant date fair value | $ / shares | $ 27.81 | |||||
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