Annual report pursuant to Section 13 and 15(d)

Share-Based Compensation - Additional Information (Detail)

v2.4.0.6
Share-Based Compensation - Additional Information (Detail)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares of common stock to be granted under equity incentive awards 375,000  
Shares available for issuance under the Plan   21,550
Period of continuous service 5 years  
Stock options, expiration term from date of grant 10 years  
Restricted stock awards, continuous employment period from date of grant required for vesting of Plan Three to five years