|
Property and Equipment - Additional Information (Detail) (USD $)
|
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
|
| Property, Plant and Equipment [Line Items] | |||
| Capitalized costs of internally developed software | $ 0 | $ 0 | $ 0 |
| Depreciation and amortization expense | $ 3,400,000 | $ 3,400,000 | $ 3,200,000 |