Quarterly report pursuant to Section 13 or 15(d)

Share-Based Compensation - Share-Based Payment Award Activity (Detail)

v2.4.0.6
Share-Based Compensation - Share-Based Payment Award Activity (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Y
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Number of Shares, Options Outstanding at Beginning of Period 342,950
Number of Shares, Options Exercised (1,679)
Number of Shares, Options Forfeited (5,251)
Number of Shares, Options Expired (700)
Number of Shares, Options Outstanding at End of Period 335,320
Number of Shares, Options Exercisable at End of Period 163,632
Weighted-Average Exercise Price Per Share, Options Outstanding at Beginning of Period $ 37.44
Weighted-Average Exercise Price Per Share, Options Exercised $ 12.54
Weighted-Average Exercise Price Per Share, Options Forfeited $ 12.54
Weighted-Average Exercise Price Per Share, Options Expired $ 120.96
Weighted-Average Exercise Price Per Share, Options Outstanding at End of Period $ 37.78
Weighted-Average Exercise Price Per Share, Options Exercisable at End of Period $ 64.38
Weighted-Average Remaining Contractual Life, Options Outstanding at Beginning of Period 8
Weighted-Average Remaining Contractual Life, Options Exercised 9.7
Weighted-Average Remaining Contractual Life, Options Forfeited 9 years 8 months 12 days
Weighted-Average Remaining Contractual Life, Options Expired 1 year 8 months 12 days
Weighted-Average Remaining Contractual Life, Options Outstanding at End of Period 7.7
Weighted-Average Remaining Contractual Life, Options Exercisable at End of Period 5 years 10 months 24 days
Aggregate Intrinsic Value of In-the-Money Options, Options Outstanding at Beginning of Period $ 359
Aggregate Intrinsic Value of In-the-Money Options, Options Exercised   
Aggregate Intrinsic Value of In-the-Money Options, Options Forfeited   
Aggregate Intrinsic Value of In-the-Money Options, Options Expired   
Aggregate Intrinsic Value of In-the-Money Options, Options Outstanding at End of Period 721
Aggregate Intrinsic Value of In-the-Money Options, Options Exercisable at End of Period $ 364