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Stock-based Compensation Plans - TSR - PSUs Activities (Detail) - Performance Based TSR - PSUs - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Summary of Performance Share Unit Awards outstanding, Number of Units      
Outstanding, Beginning Balance 1,009,842 871,299 499,943
Granted [1] 329,486 358,519 413,959
Vested and issued (73,985) [2] (85,461) [3]  
Forfeited (197,457) (134,515) (42,603)
Outstanding, Ending Balance 1,067,886 1,009,842 871,299
Summary of Performance Share Unit Awards outstanding, Weighted Average Grant Date Fair Value      
Outstanding, Beginning Balance, weighted average grant date fair value $ 38.38 $ 55.29 $ 69.95
Granted, weighted average grant date fair value [1] 18.51 26.26 36.64
Vested, weighted average grant date fair value 56.81 [2] 86.23 [3]  
Forfeited, weighted average grant date fair value 55.46 85.24 46.09
Outstanding, Ending Balance, weighted average grant date fair value $ 27.81 $ 38.38 $ 55.29
[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 2016 and 2017) and may be between zero and 200% (for TSR-PSUs granted in 2018) 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 the 36th percentile for the May 2015 grant. The remaining 2015 awards are considered to be forfeited.
[3] 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.