Share-Based Compensation (Summary of RSU Activity) (Detail) - Restricted stock units shares in Thousands |
3 Months Ended |
|---|---|
|
Mar. 31, 2016
$ / shares
shares
| |
| RSU, Shares | |
| RSUs unvested at December 31, 2015 | shares | 1,354 |
| Granted during 2016 | shares | 890 |
| Vested during 2016 | shares | (655) |
| Forfeited during 2016 | shares | (7) |
| RSUs unvested at March 31, 2016 | shares | 1,582 |
| RSU, Weighted-average grant-date fair value | |
| Beginning Balance, Weighted-average grant-date fair value | $ / shares | $ 29.20 |
| Granted, Weighted-average grant-date fair value | $ / shares | 36.85 |
| Vested, Weighted-average grant-date fair value | $ / shares | 30.95 |
| Forfeited, Weighted-average grant-date fair value | $ / shares | 27.98 |
| Ending Balance, Weighted-average grant-date fair value | $ / shares | $ 32.78 |