|
Research and Development Costs - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | |
|---|---|---|
|
Mar. 31, 2015
|
Mar. 31, 2014
|
|
| Schedule Of Research And Development [Line Items] | ||
| Research and development costs related to software development | $ 5.9 | $ 4.5 |