Annual report pursuant to Section 13 and 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
12 Months Ended
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized Expense $ 989
Average Expected Recognition Period 2 years 9 months 18 days
Stock Option Awards [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized Expense 932
Average Expected Recognition Period 2 years 10 months 24 days
Restricted Stock Awards [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized Expense $ 57
Average Expected Recognition Period 1 year 2 months 12 days