Quarterly report pursuant to Section 13 or 15(d)

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

v2.4.0.8
Share-Based Compensation - Share-Based Payment Award Activity (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Y
Sep. 30, 2012
Sep. 30, 2013
Y
Sep. 30, 2012
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]        
Number of Shares, Options outstanding at beginning of period 329,970   342,950  
Number of Shares, Options granted 305,000   305,000  
Number of Shares, Options exercised (38,437) 0 (40,678) 0
Number of Shares, Options forfeited (16,125)   (22,501)  
Number of Shares, Options expired (8,750)   (13,113)  
Number of Shares, Options outstanding at end of period 571,658   571,658  
Number of Shares, Options exercisable at end of period 124,220   124,220  
Weighted-Average Exercise Price Per Share, Options outstanding at beginning of period $ 37.43   $ 37.44  
Weighted-Average Exercise Price Per Share, Options granted $ 16.43   $ 16.43  
Weighted-Average Exercise Price Per Share, Options exercised $ 11.18   $ 11.25  
Weighted-Average Exercise Price Per Share, Options forfeited $ 12.46   $ 12.48  
Weighted-Average Exercise Price Per Share, Options expired $ 45.28   $ 59.36  
Weighted-Average Exercise Price Per Share, Options outstanding at end of period $ 28.58   $ 28.58  
Weighted-Average Exercise Price Per Share, Options exercisable at end of period $ 76.83   $ 76.83  
Weighted-Average Remaining Contractual Life, Options outstanding at beginning of period 7.5   8.0  
Weighted-Average Remaining Contractual Life, Options granted 9.9   9.9  
Weighted-Average Remaining Contractual Life, Options exercised 7.7   7.7  
Weighted-Average Remaining Contractual Life, Options forfeited 9 years   9 years 1 month 6 days  
Weighted-Average Remaining Contractual Life, Options expired 4 years 8 months 12 days   4 years 3 months 18 days  
Weighted-Average Remaining Contractual Life, Options outstanding at end of period 8.6   8.6  
Weighted-Average Remaining Contractual Life, Options exercisable at end of period 4 years 10 months 24 days   4 years 10 months 24 days  
Aggregate Intrinsic Value of In-the-Money Options, Options outstanding at beginning of period $ 1,015   $ 359  
Aggregate Intrinsic Value of In-the-Money Options, Options granted          
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 636   636  
Aggregate Intrinsic Value of In-the-Money Options, Options exercisable at end of period $ 258   $ 258