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Equity-Based Compensation - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Stock Options
Dec. 31, 2012
Unvested Stock Awards
Dec. 31, 2012
2004 Plan
Dec. 31, 2003
Directors Stock Option Plan
Dec. 31, 2002
Directors Stock Option Plan
Dec. 31, 2001
Directors Stock Option Plan
Dec. 31, 2001
Directors Stock Option Plan
Maximum
Dec. 31, 2001
Directors Stock Option Plan
Minimum
Dec. 31, 2003
1999 Plan
Dec. 31, 2002
1999 Plan
Dec. 31, 1999
1999 Plan
Age
Dec. 31, 1999
1999 Plan
Maximum
Dec. 31, 1999
1999 Plan
Minimum
Dec. 31, 2012
2012 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Shares available for potential grants           200,000     108,900         332,750     600,000
Option granted, maximum exercise period                                 10 years
Percentage of stock award vesting                                 25.00%
Stock awards vesting period           3 years                      
Option available for grant expiration period                   10 years 2 years            
Percentage of stock dividend paid             10.00% 10.00%       10.00% 10.00%        
Option grant period                             5 years 4 years  
Employees retirement age                           62      
Vested option exercised period                             90 days    
Tax benefits resulting from tax deductions in excess of compensation expense recognized $ 6 $ 5 $ 9                            
Equity-based compensation expense 132 98 58                            
Unrecognized compensation cost related to unvested stock options       140                          
Unrecognized compensation cost expected to be recognized over a weighted average period       11 months 19 days 1 year 3 months 15 days                        
Weighted average grant-date fair value of options granted   $ 2.56                              
Aggregate intrinsic value of options exercised 16 13 23                            
Stock option granted 0   0                            
Unrecognized compensation cost related to unvested stock awards         $ 179