Quarterly report pursuant to Section 13 or 15(d)

Share-Based Compensation - Summary of Stock Options Outstanding under Plans (Detail)

v2.4.0.8
Share-Based Compensation - Summary of Stock Options Outstanding under Plans (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Y
Jun. 30, 2013
Jun. 30, 2014
Y
Jun. 30, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]        
Options outstanding at beginning of period 502,188   546,595  
Number of Shares, Options granted 105,000   105,000  
Number of Shares, Options exercised (18,500) (562) (33,695) (2,241)
Number of Shares, Options forfeited (6,500)   (7,875)  
Number of Shares, Options expired (275)   (28,112)  
Number of Shares, Options outstanding at end of period 581,913   581,913  
Number of Shares, Options exercisable at end of period 96,663   96,663  
Weighted-Average Exercise Price Per Share, Options outstanding at beginning of period $ 24.31   $ 28.09  
Weighted-Average Exercise Price Per Share, Options granted $ 21.87   $ 21.87  
Weighted-Average Exercise Price Per Share, Options exercised $ 12.54   $ 12.54  
Weighted-Average Exercise Price Per Share, Options forfeited $ 12.54   $ 12.54  
Weighted-Average Exercise Price Per Share, Options expired $ 144.00   $ 105.91  
Weighted-Average Exercise Price Per Share, Options outstanding at end of period $ 24.32   $ 24.32  
Weighted-Average Exercise Price Per Share, Options exercisable at end of period $ 61.05   $ 61.05  
Weighted-Average Remaining Contractual Life, Options outstanding at beginning of period 8.6   8.4  
Weighted-Average Remaining Contractual Life, Options granted 9 years 10 months 24 days   9 years 10 months 24 days  
Weighted-Average Remaining Contractual Life, Options exercised 8.0   8.2  
Weighted-Average Remaining Contractual Life, Options forfeited 8 years 6 months   8 years 6 months  
Weighted-Average Remaining Contractual Life, Options expired 1 year 9 months 18 days   6 months  
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 5 years 7 months 6 days   5 years 7 months 6 days  
Aggregate Intrinsic Value of In-the-Money Options, Options outstanding at beginning of period $ 3,873   $ 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 2,168   2,168  
Aggregate Intrinsic Value of In-the-Money Options, Options exercisable at end of period 560   560  
Aggregate Intrinsic Value of In-the-Money Options, Options granted