Debt (Details) (USD $)	6 Months Ended		1 Months Ended		1 Months Ended				6 Months Ended			6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Credit agreement	Jun. 30, 2013 Restated Credit Agreement	Jul. 31, 2013 Revolving Credit Facility Restated Credit Agreement	Jun. 12, 2013 Revolving Credit Facility Restated Credit Agreement	Jun. 12, 2013 Letter of credit Restated Credit Agreement	Jun. 12, 2013 Swing line loan Restated Credit Agreement	Jun. 30, 2013 Term Loan A Facility Restated Credit Agreement item	Jun. 12, 2013 Term Loan A Facility Restated Credit Agreement	Jun. 12, 2013 Incremental Facility Restated Credit Agreement	Jun. 30, 2013 Revolving and Term Loans Restated Credit Agreement Alternate base rate item	Jun. 30, 2013 Revolving and Term Loans Restated Credit Agreement Alternate base rate Minimum	Jun. 30, 2013 Revolving and Term Loans Restated Credit Agreement Alternate base rate Maximum	Jun. 30, 2013 Revolving and Term Loans Restated Credit Agreement Prime rate	Jun. 30, 2013 Revolving and Term Loans Restated Credit Agreement Federal funds rate	Jun. 30, 2013 Revolving and Term Loans Restated Credit Agreement LIBOR item	Jun. 30, 2013 Revolving and Term Loans Restated Credit Agreement LIBOR Minimum	Jun. 30, 2013 Revolving and Term Loans Restated Credit Agreement LIBOR Maximum
Debt
Number of equal consecutive quarterly principal installments									20
Quarterly principal installments									$ 5,000,000
Maximum borrowing facility						200,000,000	25,000,000	10,000,000		225,000,000	75,000,000
Variable interest rate base (as a percent)													Alternate Base Rate	Alternate Base Rate	prime rate	federal funds rate	adjusted LIBOR rate for a one-month period	adjusted LIBOR rate (based on one, two, three or six-month interest periods)	adjusted LIBOR rate (based on one, two, three or six-month interest periods)
Percentage points added to the reference rate													0.25%	1.25%		0.50%	1.00%	1.25%	2.25%
Number of fiscal quarters used in calculating the consolidated leverage ratio												4					4
Amount paid			92,500,000
Amount borrowed					125,000,000				225,000,000
Percentage of the capital stock of Advent's or a guarantor's first-tier foreign subsidiaries serving as collateral on the obligations				66.00%
Maximum leverage ratio, Covenant				4.00
Maximum leverage ratio, Actual				2.24
Minimum interest coverage ratio, Covenant				2.50
Minimum interest coverage ratio, Actual				32.9
Default interest rate (as a percent)				2.00%
Changes in current portion of long-term debt
Balance at the beginning of period	10,000,000
Repayment of debt	(10,000,000)
Proceeds from debt	20,000,000
Balance at the end of period	20,000,000
Changes in non-current portion of long-term debt
Balance at the beginning of period	85,000,000
Repayment of debt	(85,000,000)
Proceeds from debt	205,000,000
Balance at the end of period	205,000,000
Changes in long-term debt
Balance at the beginning of period	95,000,000
Repayment of debt	(95,000,000)	(2,500,000)
Proceeds from debt	225,000,000
Balance at the end of period	$ 225,000,000