|
Commitments - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
|
| Schedule Of Contractual Commitments [Line Items] | |||
| Expiration of operating lease agreements | Through 2018 | ||
| Expiration of other contractual obligations | Through 2016 | ||
| Rent expense | $ 1.9 | $ 1.9 | $ 2.0 |