Debt - Additional Information (Detail) (USD $)	12 Months Ended									1 Months Ended					1 Months Ended
	Dec. 31, 2011	Nov. 10, 2011	Dec. 31, 2011 Minimum	Dec. 31, 2011 Maximum	Dec. 31, 2011 Parent Company and Domestic Subsidiaries	Dec. 31, 2011 Foreign Subsidiaries	Dec. 31, 2011 Prior to closing date of acquisition of S1 and until the earlier to occur of the one-year anniversary of such closing date	Dec. 31, 2011 If closing date of acquisition of S1 occurs prior to the one-year anniversary of closing date	Dec. 31, 2011 On and after one-year anniversary of closing date	Nov. 10, 2011 Revolving Credit Facility	Nov. 10, 2011 Term Credit Facility	Sep. 29, 2011 Senior Secured Revolving Credit Facility	Nov. 10, 2011 Senior Secured Revolving Credit Facility Minimum	Sep. 29, 2011 Senior Secured Revolving Credit Facility Minimum	Nov. 10, 2011 Senior Secured Revolving Credit Facility Maximum	Sep. 29, 2011 Senior Secured Revolving Credit Facility Maximum
Debt Instrument [Line Items]
Credit facilities, maximum borrowing capacity										$ 250,000,000	$ 200,000,000	$ 100,000,000
Credit facilities, maturity										5 years	5 years	5 years
Senior secured revolving credit facility, maturity date												Sep. 29, 2016
Note payable under credit facility	75,000,000	75,000,000
Debt issuance costs		12,300,000
Payment of debt issuance costs	$ 11,789,000
Credit facility, interest rate description	Borrowings under the Credit Facility bear interest at a rate per annum equal to, at the Company’s option, either (a) a base rate determined by reference to the highest of (1) the rate of interest per annum publicly announced by the Administrative Agent as its Prime Rate, (2) the federal funds effective rate plus 1/2 of 1% and (3) a LIBOR based rate determined by reference to the costs of funds for U.S. dollar deposits for a one-month interest period adjusted for certain additional costs plus 1% or (b) a LIBOR based rate determined by reference to the costs of funds for U.S. dollar deposits for the interest period relevant to such borrowing adjusted for certain additional costs, in each case plus an applicable margin. The applicable margin for borrowings under the Revolving Credit Facility is, based on the calculation of the applicable consolidated total leverage ratio, between 0.50% to 1.50% with respect to base rate borrowings and between 1.50% and 2.50% with respect to LIBOR based borrowings. The initial borrowing rate on November 10, 2011 was set using the 30-day LIBOR rate, effecting a rate of 2.25%. Interest is due and payable monthly.											The Company could select either a base rate loan or a LIBOR based loan. Base rate loans are computed at the highest of (a) the national prime interest rate as announced by Wells Fargo, (b) the sum of the Federal fund rate plus 0.5%, or (c) the LIBOR rate for an interest period of one month plus 1.0%, in each case, plus a margin ranging from 0.50% to 1.25%. LIBOR based loans are computed at the applicable LIBOR rate plus a margin ranging from 1.50% to 2.25%. The margins are dependent upon the Company’s total leverage ratio at the end of each quarter. The initial borrowing rate on September 29, 2011 was set using the LIBOR rate option, effecting a rate of 1.74%. Interest was due and payable quarterly
Credit facility, interest rate margin above federal fund rate	0.50%											0.50%
Credit facility, interest rate margin above one-month LIBOR rate	1.00%											1.00%
Credit facility, interest rate margin above base rate			0.50%	1.50%										0.50%		1.25%
Credit facility, interest rate margin above base rate			1.50%	2.50%										1.50%		2.25%
Credit facility, borrowing rate		2.25%										1.74%
Percentage of capital stock pledged as collateral					100.00%	65.00%
Maximum consolidated total leverage ratio							3.50	3.25	3.00
Senior secured revolving credit facility, unused quarterly commitment fee													0.25%		0.40%