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Stock-Based Compensation Plans and Employee Benefits - Summary of Characteristics of Options Outstanding (Detail)
shares in Thousands
12 Months Ended
Dec. 31, 2016
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Outstanding at 12/31/16 | shares 1,806
Weighted-Average Remaining Contractual Life (Years) 6 years 1 month 6 days
Weighted-Average Exercise Price - Options Outstanding $ 19.16
Exercisable at 12/31/16 | shares 1,038
Weighted-Average Exercise Price - Options Exercisable $ 20.49
0.00 - 12.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Limit 0.00
Exercise Price Range, Upper Limit $ 12.00
Outstanding at 12/31/16 | shares 175
Weighted-Average Remaining Contractual Life (Years) 2 years 4 months 24 days
Weighted-Average Exercise Price - Options Outstanding $ 7.49
Exercisable at 12/31/16 | shares 175
Weighted-Average Exercise Price - Options Exercisable $ 7.49
12.01 - 16.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Limit 12.01
Exercise Price Range, Upper Limit $ 16.00
Outstanding at 12/31/16 | shares 177
Weighted-Average Remaining Contractual Life (Years) 4 years 8 months 12 days
Weighted-Average Exercise Price - Options Outstanding $ 13.88
Exercisable at 12/31/16 | shares 177
Weighted-Average Exercise Price - Options Exercisable $ 13.88
16.01 - 21.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Limit 16.01
Exercise Price Range, Upper Limit $ 21.00
Outstanding at 12/31/16 | shares 1,261
Weighted-Average Remaining Contractual Life (Years) 7 years 7 months 6 days
Weighted-Average Exercise Price - Options Outstanding $ 17.36
Exercisable at 12/31/16 | shares 493
Weighted-Average Exercise Price - Options Exercisable $ 17.35
21.01 - 66.75 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Range, Lower Limit 21.01
Exercise Price Range, Upper Limit $ 66.75
Outstanding at 12/31/16 | shares 193
Weighted-Average Remaining Contractual Life (Years) 9 months 18 days
Weighted-Average Exercise Price - Options Outstanding $ 46.38
Exercisable at 12/31/16 | shares 193
Weighted-Average Exercise Price - Options Exercisable $ 46.38