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Stock-based Compensation Plans - TSR - PSUs Activities (Detail) - Performance Based TSR - PSUs - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Summary of Performance Share Unit Awards outstanding, Number of Units      
Outstanding, Beginning Balance 1,067,886 1,009,842 871,299
Granted [1] 314,152 329,486 358,519
Vested and issued (12,283) [2] (73,985) [3] (85,461) [4]
Forfeited (376,303) (197,457) (134,515)
Outstanding, Ending Balance 993,452 1,067,886 1,009,842
Summary of Performance Share Unit Awards outstanding, Weighted Average Grant Date Fair Value      
Outstanding, Beginning Balance, weighted average grant date fair value $ 27.81 $ 38.38 $ 55.29
Granted, weighted average grant date fair value [1] 11.34 18.51 26.26
Vested, weighted average grant date fair value 30.47 [2] 56.81 [3] 86.23 [4]
Forfeited, weighted average grant date fair value 37.25 55.46 85.24
Outstanding, Ending Balance, weighted average grant date fair value $ 19.00 $ 27.81 $ 38.38
[1] These amounts reflect the number of performance units granted. The actual payout of shares may be between zero and 150% (for TSR-PSUs granted in 2017) and may be between zero and 200% (for TSR-PSUs granted in 2018 and 2019) 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 2016 performance 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. The May 2016 awards were 100% forfeited as the performance was not achieved.
[3] 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 the 36th percentile for the May 2015 grant. The remaining 2015 awards are considered to be forfeited.
[4] Includes 85,461 TSR-PSU awards issued related to the 2014 performance period where the return on our common stock was the 67th percentile for the February 2014 grant and 56th percentile for the May 2014 grant. The remaining 2014 awards are considered to be forfeited.