|
Equity - Summary of Restricted Stock Units (Detail) (USD $)
|
3 Months Ended |
|
Mar. 31, 2015
|
| Restricted Stock Units |
|
| Number of Shares |
|
| Beginning balance (in shares) |
746,612 |
| Granted (in shares) |
418,584 |
| Vested (in shares) |
(132,476) |
| Forfeited (in shares) |
(70,773) |
| Ending balance (in shares) |
961,947 |
| Weighted Average Fair Value |
|
| Beginning balance (in USD per share) |
$ 31.40 |
| Granted (in USD per share) |
$ 33.81 |
| Vested (in USD per share) |
$ 29.68 |
| Forfeited (in USD per share) |
$ 35.72 |
| Ending balance (in USD per share) |
$ 32.35 |
| Performance Shares |
|
| Number of Shares |
|
| Granted (in shares) |
0 |
| Maximum | Restricted Stock Units |
|
| Number of Shares |
|
| Vesting period |
3 years |