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Employee Deferred Compensation Plan and Employee Stock Purchase Plan - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Jun. 30, 2001
Employee Stock Purchase Plan
Dec. 31, 2013
Employee Stock Purchase Plan
Jun. 30, 2011
Employee Stock Purchase Plan
Dec. 31, 2013
Employee Stock Purchase Plan
Dec. 31, 2012
Employee Stock Purchase Plan
Dec. 31, 2011
Employee Stock Purchase Plan
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]                  
Percentage contribution, compensation 100.00%                
Matching percentage, employee contribution 5.00%                
Company's contributions amount $ 1,330 $ 982 $ 870            
Number of common stock shares under employee stock purchase plan       1,000,000          
Common stock under employee stock purchase plan, par value $ 0.10 $ 0.10   $ 0.10          
Employee stock purchase plan offering period       January 1 and July 1 of each year          
Commons stock plan available for sale under plan           995,000      
Authorized common stock under plan         901,220        
Shares of common stock purchased through the plan             27,923 40,116 54,933