|
Property and Equipment - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2013
|
Dec. 31, 2012
|
Dec. 31, 2011
|
|
| Property Plant And Equipment [Abstract] | |||
| Depreciation expense for property and equipment | $ 5.2 | $ 4.0 | $ 3.6 |