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
Mar. 31, 2014
Y
Mar. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]    
Options outstanding at beginning of period 546,595  
Number of Shares, Options exercised (15,195) (1,679)
Number of Shares, Options forfeited (1,375)  
Number of Shares, Options expired (27,837)  
Number of Shares, Options outstanding at end of period 502,188  
Number of Shares, Options exercisable at end of period 111,938  
Weighted-Average Exercise Price Per Share, Options outstanding at beginning of period $ 28.09  
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 $ 105.53  
Weighted-Average Exercise Price Per Share, Options outstanding at end of period $ 24.31  
Weighted-Average Exercise Price Per Share, Options exercisable at end of period $ 54.80  
Weighted-Average Remaining Contractual Life, Options outstanding at beginning of period 8.4  
Weighted-Average Remaining Contractual Life, Options exercised 8.7  
Weighted-Average Remaining Contractual Life, Options forfeited 8 years 8 months 12 days  
Weighted-Average Remaining Contractual Life, Options expired 8 months 12 days  
Weighted-Average Remaining Contractual Life, Options outstanding at end of period 8.6  
Weighted-Average Remaining Contractual Life, Options exercisable at end of period 6 years 3 months 18 days  
Aggregate Intrinsic Value of In-the-Money Options, Options outstanding at beginning of period $ 3,384  
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 3,873  
Aggregate Intrinsic Value of In-the-Money Options, Options exercisable at end of period $ 855