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Stock and Incentive Programs for Employees and Directors - Schedule of Stock Option Activity (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Shares Under Option    
Outstanding at beginning of period 1,551  
Cancelled/forfeited/expired (294)  
Outstanding at end of period 1,257 1,551
Vested and exercisable at end of period 1,257  
Weighted Average Exercise Price    
Outstanding at beginning of period $ 37.19  
Cancelled/forfeited/expired 58.19  
Outstanding at end of period 32.28 $ 37.19
Vested and exercisable at end of period $ 32.28  
Weighted Average Remaining Contractual Term (years)    
Outstanding 1 year 7 months 6 days 2 years 2 months 12 days
Vested and exercisable at end of period 1 year 7 months 6 days  
Aggregate Intrinsic Value    
Outstanding at beginning of period $ 1.7  
Outstanding at end of period   $ 1.7