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Stock Plans and Other Incentives - Additional Information (Detail) (USD $)
 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Minimum [Member]
Dec. 31, 2013
Maximum [Member]
Dec. 31, 2013
RSU [Member]
Dec. 31, 2012
RSU [Member]
Dec. 31, 2011
RSU [Member]
Feb. 28, 2013
RSU [Member]
Employees [Member]
Feb. 29, 2012
RSU [Member]
Employees [Member]
Mar. 31, 2011
RSU [Member]
Employees [Member]
Dec. 31, 2013
RSU [Member]
Non-Employee Directors [Member]
Dec. 31, 2012
RSU [Member]
Non-Employee Directors [Member]
Dec. 31, 2011
RSU [Member]
Non-Employee Directors [Member]
Dec. 31, 2013
Money Option [Member]
Dec. 31, 2012
Money Option [Member]
Dec. 31, 2013
Non-Employee Directors Compensation Plan [Member]
Dec. 31, 2012
Non-Employee Directors Compensation Plan [Member]
Dec. 31, 2011
Non-Employee Directors Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                      
Expiration period of the awards granted under the company's incentive plans 10 years                                    
Vesting period for Incentive Plans       3 years 5 years                            
Liability for option cancellations amount                             $ 268,000 $ 297,000      
Closing stock price $ 19.23 $ 13.03 $ 9.12                                
Outstanding in-the-money options 17,724 35,448 53,172                       17,724 35,448      
Recorded compensation expense (benefit) 82,000 114,000 121,000                                
Total stock options settled with net cash payments 8,862 8,862 8,862                                
Net cash payments to stock options 110,000 58,000 38,000                                
Option awards granted                                         
RSUs granted           103,176 169,481 251,281 91,356 143,783 214,135 11,820 25,698 37,146          
Weighted average grant date fair value                 $ 16.20 $ 10.05 $ 7.41 $ 15.56 $ 9.54 $ 8.25          
Vesting Rights           RSUs vest one-third a year over three years                          
Number of months after the termination of service, RSUs delivered to non-employee directors                       6 months              
Shares issued for settlement of vested director restricted stock units   72,410 6,270                                
Non-cash compensation expense 1,859,336 2,181,135 2,083,497                           173,000 222,000 295,000
Compensation cost expected to be recognized $ 1,637,000         $ 1,637,000