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Stock-based Compensation Plans - Restricted Stock and Restricted Stock Units Outstanding (Detail) - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Equity Awards      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Outstanding, Beginning Balance 436,764 360,415 385,063
Granted 973,491 587,711 356,194
Vested (525,617) (480,253) (354,237)
Forfeited (118,667) (31,109) (26,605)
Outstanding, Ending Balance 765,971 436,764 360,415
Outstanding, Beginning Balance, weighted average grant date fair value $ 59.74 $ 79.60 $ 68.24
Granted, weighted average grant date fair value 28.51 52.29 84.87
Vested, weighted average grant date fair value 43.83 65.21 72.85
Forfeited, weighted average grant date fair value 42.60 64.73 75.66
Outstanding, Ending Balance, weighted average grant date fair value $ 33.62 $ 59.74 $ 79.60
Liability Awards      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Outstanding, Beginning Balance 308,737 304,504 389,013
Granted 540,128 343,397 272,052
Vested (374,328) (330,870) (356,413)
Forfeited (49,519) (8,294) (148)
Outstanding, Ending Balance 425,018 308,737 304,504
Outstanding, Beginning Balance, weighted average grant date fair value $ 65.80 $ 80.33 $ 71.02
Granted, weighted average grant date fair value 35.92 55.92 87.34
Vested, weighted average grant date fair value 51.40 68.71 75.52
Forfeited, weighted average grant date fair value 40.33 74.22 77.35
Outstanding, Ending Balance, weighted average grant date fair value $ 43.48 $ 65.80 $ 80.33