Stock-Based Compensation Plans - Summary of Restricted Stock Award Activity (Detail)
|
3 Months Ended |
|
Mar. 31, 2018
$ / shares
shares
|
|---|
| Restricted Stock |
|
| Number of Shares |
|
| Outstanding, beginning balance | shares |
1,188,662
|
| Granted | shares |
94,592
|
| RS’s Vested/RSU’s Issued | shares |
(123,918)
|
| Forfeited | shares |
(24,639)
|
| Outstanding, ending balance | shares |
1,134,697
|
| Weighted Average Grant Date Fair Value |
|
| Outstanding, beginning balance (in USD per share) | $ / shares |
$ 45.07
|
| Granted (in USD per share) | $ / shares |
64.79
|
| RS's Vested/RSU's Issued (in USD per share) | $ / shares |
45.06
|
| Forfeited (in USD per share) | $ / shares |
44.62
|
| Outstanding, ending balance (in USD per share) | $ / shares |
$ 46.72
|
| Restricted Stock Units |
|
| Number of Shares |
|
| Outstanding, beginning balance | shares |
285,164
|
| Granted | shares |
6,924
|
| RS’s Vested/RSU’s Issued | shares |
0
|
| Forfeited | shares |
0
|
| Outstanding, ending balance | shares |
292,088
|
| Weighted Average Grant Date Fair Value |
|
| Outstanding, beginning balance (in USD per share) | $ / shares |
$ 29.95
|
| Granted (in USD per share) | $ / shares |
67.75
|
| RS's Vested/RSU's Issued (in USD per share) | $ / shares |
0.00
|
| Forfeited (in USD per share) | $ / shares |
0.00
|
| Outstanding, ending balance (in USD per share) | $ / shares |
$ 30.85
|