Annual report pursuant to Section 13 and 15(d)

Share-Based Compensation - Summary of Information under Plans (Detail)

v2.4.0.6
Share-Based Compensation - Summary of Information under Plans (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grant Date Fair Value of Options Granted $ 1,197 $ 156   
Fair Value of Options Vested 911 1,272 538
Total Intrinsic Value of Options Exercised 6    14
Cash Received from Options Exercised $ 10    $ 22
Weighted-Average Estimated Fair Value Per Share of Options Granted $ 5.40 $ 6.23