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Debt - Additional Information (Detail) (USD $)
 6 Months Ended 12 Months Ended 3 Months Ended 1 Months Ended 1 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Feb. 10, 2012
Nov. 10, 2011
Jun. 30, 2012
Minimum
Jun. 30, 2012
Maximum
Jun. 30, 2012
License agreement
Jun. 30, 2012
Parent Company and Domestic Subsidiaries
Jun. 30, 2012
Foreign Subsidiaries
Feb. 10, 2012
Revolving Credit Facility
Nov. 10, 2011
Revolving Credit Facility
Jun. 30, 2012
Revolving Credit Facility
Maximum
Feb. 10, 2012
Term Credit Facility
Nov. 10, 2011
Term Credit Facility
Debt Instrument [Line Items]                            
Credit facilities, maximum borrowing capacity                     $ 250,000,000     $ 200,000,000
Credit facilities, maturity                     5 years     5 years
Unused borrowings                       80,000,000    
Note payable under credit facility     370,000,000 75,000,000                    
Additional borrowing under credit facility                   95,000,000     200,000,000  
Debt issuance costs     12,300,000                      
Payment of debt issuance cost 553,000 11,800,000                        
Credit facility, interest rate description 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. Interest is due and payable monthly. The interest rate in effect at June 30, 2012 was 2.25%.                          
Credit facility, interest rate margin above federal fund rate 0.50%                          
Credit facility, interest rate margin above one-month LIBOR rate 1.00%                          
Credit facility, interest rate margin above base rate         0.50% 1.50%                
Credit facility, interest rate margin above LIBOR rate         1.50% 2.50%                
Credit facility, borrowing rate 2.25%                          
Repayment of term portion of credit agreement 6,250,000                          
Percentage of capital stock pledged as collateral               100.00% 65.00%          
Financed internally used software             14,800,000              
License agreement period             5 years              
Accrued and other current liabilities             2,900,000              
Other non current liabilities             $ 9,300,000