Quarterly report pursuant to Section 13 or 15(d)

Share-Based Compensation - Unrecognized Share-Based Compensation Expense (Detail)

v2.4.0.6
Share-Based Compensation - Unrecognized Share-Based Compensation Expense (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized Expense $ 893
Average Expected Recognition Period 2 years 7 months 6 days
Stock Option Awards [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized Expense 849
Average Expected Recognition Period 2 years 8 months 12 days
Restricted Stock Awards [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized Expense $ 44
Average Expected Recognition Period 1 year