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Stock-Based Compensation - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended
May 31, 2012
Apr. 30, 1999
Dec. 31, 2012
Jun. 30, 2012
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Restricted stock [Member]
Dec. 31, 2011
Restricted stock [Member]
Mar. 31, 2012
Restricted stock [Member]
Dec. 31, 2012
Stock Options [Member]
Dec. 31, 2011
Stock Options [Member]
Dec. 31, 2012
2013 $3.02 value per option [Member]
Dec. 31, 2012
2013 $1.86 value per option [Member]
Dec. 31, 2012
2012 $2.75 value per option [Member]
Dec. 31, 2012
2012 $2.58 value per option [Member]
Dec. 31, 2012
2012 $2.72 value per option [Member]
Dec. 31, 2012
2012 $2.81 value per option [Member]
Dec. 31, 2012
2012 $2.13 value per option [Member]
Dec. 31, 2012
2012 Plan [Member]
Dec. 31, 2012
2006 Plan [Member]
Dec. 31, 2012
2004 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                            
Stock-based compensation expense, net of tax     $ 84   $ 121 $ 353 $ 311                              
Stock-based compensation expense, net of tax, per diluted share     $ 0.01   $ 0.01 $ 0.04 $ 0.03                              
Shares of common stock granted     641,357     641,357                           750,000 500,000 200,000
Expiration period 10 years 5 years           9 months   3 years                        
Options granted           400,000                                
Weighted average grant date fair value       $ 1.86   $ 8.09                                
Options valued by Black Scholes pricing model           61,000                                
Weighted-average value per option granted                         $ 3.02 $ 3.05 $ 2.75 $ 2.58 $ 2.72 $ 2.81 $ 2.13      
Options valued by Monte Carlo simulation model       350,000                                    
Cash received from stock option exercises           41                                
Common stock received in lieu of cash payment for stock option exercises           14,739                                
Aggregate intrinsic value of options exercised           162                                
Stock option compensation expense               141 299   468 237                    
Taxes related to stock option compensation expense               59 125   196 99                    
Unrecognized compensation cost related to stock options granted-but-not-yet-vested that are expected to become exercisable     762     762                                
Weighted-average period cost is to be recognized               1 year     3 years                      
Forfeiture provisions lapse period for non-employee directors           1 year                                
Transfer restrictions lapse period for non-employee directors           6 months                                
Unrecognized compensation cost related to non-vested restricted stock awards     $ 181     $ 181