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Stock Compensation - Summary of Stock Option Activity (Detail)
$ / shares in Units, shares in Thousands, $ in Millions
 6 Months Ended
Jun. 30, 2018
USD ($)
$ / shares
shares
Stock Options  
Outstanding at beginning of period (in shares) | shares 1,758
Granted (in shares) | shares 0
Exercised (in shares) | shares 0
Forfeited and expired (in shares) | shares (578)
Outstanding at end of period (in shares) | shares 1,180
Expected to vest at end of period (in shares) | shares 12
Exercisable at end of period (in shares) | shares 1,168
Weighted- Average Exercise Price  
Outstanding at beginning of period (in dollars per share) | $ / shares $ 26.35
Granted (in dollars per share) | $ / shares 0.00
Exercised (in dollars per share) | $ / shares 0.00
Forfeited and expired (in dollars per share) | $ / shares 23.63
Outstanding at end of period (in dollars per share) | $ / shares 27.69
Expected to vest at end of period (in dollars per share) | $ / shares 13.48
Exercisable at end of period (in dollars per share) | $ / shares $ 27.83
Weighted- Average Remaining Contractual Term (years)  
Outstanding at end of period 1 year 8 months 19 days
Expected to vest at end of period 4 years 3 months 22 days
Exercisable at end of period 1 year 8 months 9 days
Aggregate Intrinsic Value  
Outstanding at end of period | $ $ 0.0
Expected to vest at end of period | $ 0.0
Exercisable at end of period | $ $ 0.0