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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
[1] These amounts reflect the number of performance units granted. The actual payout of shares may be between zero and 200% of the performance units granted depending on the total shareholder return ranking compared to our peer companies at the vesting date.
[2] Includes 73,985 TSR-PSUs awards issued related to the 2015 performance period where the return on our common stock was the 46th percentile for the February 2015 grant and 36th percentile for the May 2015 grant. The remaining 2015 awards are considered to be forfeited.