|
Income Taxes - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | |
|---|---|---|
|
Mar. 31, 2015
|
Mar. 31, 2014
|
|
| Valuation Allowance [Line Items] | ||
| Income tax expense | $ (8.4) | $ (4.2) |
| Effective tax rate | 36.10% | 35.60% |