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Stock-based Compensation and Outstanding Awards - Summary of Stock Option Activity (Detail) - Jun. 30, 2015 - USD ($)
$ / shares in Units, $ in Millions
Total
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Options, Outstanding, Beginning balance 3,545,519
Options, Granted 534,929
Options, Forfeited (9,443)
Options, Outstanding, Ending balance 4,071,005
Options, Exercisable at June 30, 2015 2,492,713
Weighted average exercise price, Outstanding, Beginning balance $ 30.86
Weighted average exercise price, Granted 22.44
Weighted average exercise price, Forfeited 28.31
Weighted average exercise price, Outstanding, Ending balance 29.76
Weighted average exercise price, Exercisable at June 30, 2015 $ 30.93
Aggregate intrinsic value, Outstanding, Ending balance $ 1
Aggregate intrinsic value, Exercisable at March 31, 2015 $ 1