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Equity Based Compensation - Additional Information (Detail) (USD $)
 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended
Mar. 31, 2013
Apr. 22, 2013
Dec. 31, 2012
Mar. 31, 2013
1997 Stock Compensation Plan [Member]
Mar. 31, 2013
Before Amendment [Member]
Mar. 31, 2013
After Amendment [Member]
Mar. 31, 2013
2011 Stock incentive Plan [Member]
Mar. 31, 2013
2011 Stock incentive Plan [Member]
1997 Stock Compensation Plan [Member]
Mar. 31, 2013
1997 Stock Option Plan [Member]
Mar. 31, 2013
2008 Plan [Member]
2008 Restricted Stock Plan [Member]
Mar. 31, 2013
Non management director [Member]
Mar. 31, 2013
Non management director [Member]
2008 Restricted Stock Plan [Member]
Dec. 31, 2012
Team Member [Member]
2011 Stock incentive Plan [Member]
2008 Restricted Stock Plan [Member]
Mar. 31, 2013
Director compensation program [Member]
2008 Restricted Stock Plan [Member]
Maximum [Member]
Mar. 31, 2013
Erwin [Member]
Mar. 31, 2013
Dixon [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Vesting period of stock granted       5 years                        
Vesting period of stock granted 10 years                              
Percentage of option exercise price of fair value of common stock 100.00%                              
stock options, issued                 0              
stock options, exercised                 0              
stock options, forfeited                 0              
Intrinsic value of stock options $ 0   $ 0                          
Common stock, future issuance   416,964                 62,500          
Number of restricted stock granted                   59,718   8,407 8,020      
Number of shares for which vesting conditions had been met 45,803                              
Number of restricted stock granted, value 70,000                              
Cap value of matching grants                           10,000    
Purchase of common shares                             1,095 951
Stock Price $ 11.60                              
Number of shares granted 1,724                              
Number of options approved to be granted         500,000 700,000                    
Number of options exercisable after date of grant 0                              
Duration of options exercisable after the grant date 10 years                              
Number of options exercisable               0                
Pretax compensation expense related to unvested restricted stock awards granted $ 296,000           $ 1,500,000