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Treasury Stock and Share Based Awards - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Stockholders Equity Note [Line Items]    
Number of stock options exercised 14,584  
Weighted average exercise price of options exercised $ 7.63  
Intrinsic value of options exercised $ 296  
Tax benefit recognized on stock option exercised 124  
Stock options outstanding 0  
Restricted Stock
   
Stockholders Equity Note [Line Items]    
Shares of Restricted Stock Granted 234,813  
Market value of common stock on the date of grant $ 28.54  
Minimum forfeiture rate for restricted stock awards 0.00%  
Maximum forfeiture rate for restricted stock awards 5.00%  
Total fair value of shares vested during the period 17,466  
Recognized tax benefits related to shares vested during the period 6,645  
Compensation expense 2,616 2,588
Unrecognized compensation expense 18,397  
Compensation expense recognition period (in years) 2 years  
Restricted stock awards vested 586,955  
Restricted Stock | Employee Scenario One
   
Stockholders Equity Note [Line Items]    
Award vesting period for restricted stock granted 2 years  
Restricted Stock | Employee Scenario Two
   
Stockholders Equity Note [Line Items]    
Award vesting period for restricted stock granted 4 years  
Restricted Stock Units (RSUs)
   
Stockholders Equity Note [Line Items]    
Market value of common stock on the date of grant $ 28.54  
Total fair value of shares vested during the period 11,194  
Recognized tax benefits related to shares vested during the period 4,751  
Compensation expense 907 862
Unrecognized compensation expense $ 6,777  
Compensation expense recognition period (in years) 2 years  
Number of hypothetical shares of common stock 607,806  
Percentage of IRR, which is the threshold 8.50%  
Percentage of IRR, which is the target 10.50%  
Percentage of IRR, which is the maximum 12.50%  
Percentage of restricted stock units vest 100.00%  
Restricted stock awards vested 392,238  
Restricted stock unit conversion into share of common stock, conversion ratio 1  
Actual cumulative forfeitures (in units) 11,498  
Restricted Stock Units (RSUs) | Minimum
   
Stockholders Equity Note [Line Items]    
Expected forfeiture rate 0.00%  
Restricted Stock Units (RSUs) | Maximum
   
Stockholders Equity Note [Line Items]    
Expected forfeiture rate 5.00%  
Restricted Stock Units (RSUs) | Employee
   
Stockholders Equity Note [Line Items]    
Number of hypothetical shares of common stock 197,515