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Stock-based Compensation Plans - TSR - PSUs Activities (Detail) - Performance Based TSR - PSUs
3 Months Ended
Mar. 31, 2019
$ / shares
shares
Summary of Performance Share Unit Awards outstanding, Number of Units  
Outstanding, Beginning Balance | shares 1,067,886
Granted | shares 314,152 [1]
Vested and issued | shares (12,283) [2]
Forfeited | shares (79,058)
Outstanding, Ending Balance | shares 1,290,697
Summary of Performance Share Unit Awards outstanding, Weighted Average Grant Date Fair Value  
Outstanding, Beginning Balance, weighted average grant date fair value | $ / shares $ 27.81
Granted, weighted average grant date fair value | $ / shares 11.34 [1]
Vested, weighted average grant date fair value | $ / shares 30.47 [2]
Forfeited, weighted average grant date fair value | $ / shares 30.47
Outstanding, Ending Balance, weighted average grant date fair value | $ / shares $ 23.62
[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 12,283 TSR-PSUs awards issued related to the 2016 performance period where the return on our common stock was in the 20th percentile for the February 2016 grant.  The remaining February 2016 awards are considered to be forfeited