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Schedule II - Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2012
Valuation and Qualifying Accounts [Abstract]  
Valuation and Qualifying Accounts
ANSYS, INC. AND SUBSIDIARIES
Valuation and Qualifying Accounts

(in thousands)
Description
 
Balance  at
Beginning
of Year
 
Additions–
Charges to Costs
and Expenses
 
Deductions–
Returns and
Write-Offs
 
Balance at
End
of Year
Year ended December 31, 2012
Allowance for doubtful accounts
 
$
4,101

 
$
938

 
$
239

 
$
4,800

Year ended December 31, 2011
Allowance for doubtful accounts
 
$
4,503

 
$
404

 
$
806

 
$
4,101

Year ended December 31, 2010
Allowance for doubtful accounts
 
$
4,418

 
$
1,757

 
$
1,672

 
$
4,503