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Stock Options - Summary of Stock Option Activity (Detail)
$ / shares in Units, $ in Millions
 9 Months Ended
Sep. 30, 2017
USD ($)
$ / shares
shares
Shares  
Outstanding at beginning of period (in shares) | shares 2,099,000
Granted (in shares) | shares 0
Exercised (in shares) | shares (1,000)
Forfeited and expired (in shares) | shares (320,000)
Outstanding at end of period (in shares) | shares 1,778,000
Expected to vest at end of period (in shares) | shares 204,000
Exercisable at end of period (in shares) | shares 1,571,000
Weighted- Average Exercise Price  
Outstanding at beginning of period (in dollars per share) | $ / shares $ 25.41
Granted (in dollars per share) | $ / shares 0.00
Exercised (in dollars per share) | $ / shares 10.65
Forfeited and expired (in dollars per share) | $ / shares 20.22
Outstanding at end of period (in dollars per share) | $ / shares 26.35
Expected to vest at end of period (in dollars per share) | $ / shares 22.93
Exercisable at end of period (in dollars per share) | $ / shares $ 26.80
Weighted- Average Remaining Contractual Term (years)  
Outstanding at end of period 1 year 9 months 22 days
Expected to vest at end of period 3 years 8 months 12 days
Exercisable at end of period 1 year 6 months 21 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