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Summary of Stock Option Activity (Detail) - Employee Stock Option
$ / shares in Units, shares in Thousands, $ in Millions
 6 Months Ended
Jun. 30, 2016
USD ($)
$ / shares
shares
Shares  
Outstanding at December 31, 2015 (shares) | shares 2,723
Granted (shares) | shares 11
Exercised (shares) | shares 0
Forfeited and expired (shares) | shares (570)
Outstanding at June 30, 2016 (shares) | shares 2,164
Expected to vest at June 30, 2016 (shares) | shares 631
Exercisable at June 30, 2016 (shares) | shares 1,508
Weighted- Average Exercise Price  
Outstanding at December 31, 2015 (dollars per share) | $ / shares $ 27.88
Granted (dollars per share) | $ / shares 10.85
Exercised (dollars per share) | $ / shares 0.00
Forfeited and expired (dollars per share) | $ / shares 37.00
Outstanding at June 30, 2016 (dollars per share) | $ / shares 25.40
Expected to vest at June 30, 2016 (dollars per share) | $ / shares 25.89
Exercisable at June 30, 2016 (dollars per share) | $ / shares $ 25.23
Weighted- Average Remaining Contractual Term (years)  
Outstanding at June 30, 2016 2 years 9 months 7 days
Expected to vest at June 30, 2016 4 years 2 months 19 days
Exercisable at June 30, 2016 2 years 1 month 17 days
Aggregate Intrinsic Value  
Outstanding at June 30, 2016 | $ $ 0
Expected to vest at June 30, 2016 | $ 0
Exercisable at June 30, 2016 | $ $ 0