v2.4.0.8
Income Taxes - Additional Information (Details) (USD $)
 9 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Taxes [Line Items]          
Effective Income Tax Rate, Continuing Operations 34.60% 36.30% 36.20% 37.40% 38.10%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability $ (2,600,000) $ (1,200,000)      
Undistributed earnings of foreign subsidiaries     74,000,000    
Net operating loss carryforwards     4,451,000 4,722,000  
Tax credit carryforwards     1,000,000 1,000,000  
Valuation allowance     1,631,000 1,911,000  
Change in valuation allowance     300,000    
Accumulated interest and penalties     600,000 1,200,000  
Accumulated interest and penalties recorded through the income tax provision     200,000 200,000 200,000
Deferred tax asset, accumulated interest balance     100,000 200,000  
Unrecognized tax benefits that would impact effective tax rate     1,600,000 3,800,000  
Unrecognized tax benefits that would impact deferred taxes     700,000 1,700,000  
Estimated upper bound of reasonably possible changes in unrecognized tax benefits within the next 12 months     400,000    
Estimated upper bound of reasonably possible changes in unrecognized tax benefits that will impact the effective tax rate within the next 12 months     300,000    
Foreign Tax Authority
          
Income Taxes [Line Items]          
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability (1,600,000) 900,000      
State and Local Jurisdiction
          
Income Taxes [Line Items]          
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability $ 900,000