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Stockholders Equity - Summary of PSU Activity (Detail) (Performance Shares [Member], USD $)
In Thousands, except Per Share data, unless otherwise specified |
3 Months Ended |
|---|---|
|
Mar. 31, 2015
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Performance Shares [Member]
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Outstanding and non-vested, Beginning balance | 0 |
| Granted | 184 |
| Forfeited | 0 |
| Outstanding and non-vested, Ending balance | 184 |
| Outstanding and non-vested, Beginning balance | $ 0 |
| Weighted average fair value at grant date | $ 30.76 |
| Forfeited | $ 0 |
| Outstanding and non-vested, Ending balance | $ 30.76 |