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Debt (Details)
In Thousands, unless otherwise specified
 6 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2012
USD ($)
Dec. 31, 2011
USD ($)
Jun. 30, 2011
USD ($)
Jun. 30, 2012
Amended Prudential Investment Management [Member]
USD ($)
Jun. 30, 2012
JPMorgan Chase Bank, National Association [Member]
USD ($)
Jun. 30, 2012
Royal Bank of Scotland N.V. [Member]
USD ($)
Jun. 30, 2012
Royal Bank of Scotland N.V. [Member]
EUR (€)
Jun. 30, 2012
Series A Notes [Member]
USD ($)
Jun. 30, 2012
Series B Notes [Member]
USD ($)
Jun. 30, 2012
Long Term [Member]
Bank Borrowings [Member]
USD ($)
Dec. 31, 2011
Long Term [Member]
Bank Borrowings [Member]
USD ($)
Jun. 30, 2012
Long Term [Member]
Credit Facility Borrowings [Member]
USD ($)
Dec. 31, 2011
Long Term [Member]
Credit Facility Borrowings [Member]
USD ($)
Jun. 30, 2012
Long Term [Member]
Notes Payable [Member]
USD ($)
Dec. 31, 2011
Long Term [Member]
Notes Payable [Member]
USD ($)
Jun. 30, 2012
Long Term [Member]
Collateralized Borrowings [Member]
USD ($)
Dec. 31, 2011
Long Term [Member]
Collateralized Borrowings [Member]
USD ($)
Jun. 30, 2012
Long Term [Member]
Capital Lease Obligations [Member]
USD ($)
Dec. 31, 2011
Long Term [Member]
Capital Lease Obligations [Member]
USD ($)
Long-term Debt, Unclassified [Abstract]                                      
Long-term debt, gross amount outstanding $ 34,284 $ 36,455               $ 30 $ 49 $ 30,000 $ 30,000 $ 750 $ 1,500 $ 68 $ 127 $ 3,436 $ 4,779
Less: current portion 3,235 4,166                                  
Long-term portion 31,049 32,289                                  
Committed lines of credit 125,000                                    
Debt Instrument, Face Amount               10,000 10,000                    
Debt Instrument, Interest Rate, Stated Percentage               4.00% 4.10%                    
Debt Instrument, Payment Terms               7 year term 10 year term                    
Debt Instrument, Maturity Date Range, Start               2014 2015                    
Debt Instrument, Maturity Date Range, End               2018 2021                    
Amount outstanding on notes payable to owners of acquired entity 750                                    
Line of Credit Facility [Line Items]                                      
Uncommitted lines of credit 87,532                                    
Line of credit facility, Amount outstanding       20,000 10,000                            
Letters of credit, Outstanding amount 1,764                                    
Bank guarantees 1,002                                    
Commitment fees on unused lines of credit 158                                    
Line of credit facility, Covenant restriction, Maximum Indebtedness to EBITDA         3.00 to 1                            
Line of credit facility, Covenant restriction, Minimum EBITDA to interest expense         3.50 to 1                            
Indebtedness to EBITDA ratio         0.47 to 1                            
EBITDA to interest expense ratio         30.35 to 1                            
Credit Facilities [Abstract]                                      
Line of credit facility, Maximum borrowing capacity 5,000     80,000 125,000 2,532 2,000                        
Line of credit facility, Expiration date       July 24, 2015 May 5, 2016                            
Percentage stock of certain first tier foreign subsidiaries pledged as collateral under the credit agreement (in hundredths)         65.00%                            
Line of credit facility, Minimum commitment fee percentage (in hundredths)         0.25%                            
Line of credit facility, Maximum commitment fee percentage (in hundredths)         0.40%                            
Interest rate spread added to federal funds rate (in hundredths)         0.50%                            
Restriction on dividends and repurchases of common stock, Minimum       50,000 50,000                            
Restriction on dividends and repurchases of common stock, Maximum       75,000 75,000                            
Line of credit facility, weighted average interest rate at end of period (in hundredths)         1.74%                            
Amount of additional line of credit borrowing available         62,500                            
Line of credit facility, Expanded Maximum borrowing capacity         187,500                            
Sublimit on borrowings by foreign subsidiaries         100,000                            
Interest rate spread added to LIBOR rate for one month (in hundredths)         1.00%                            
Minimum interest rate spread added to LIBOR rate for one month based on leverage ratio (in hundredths)         0.50%                            
Maximum interest rate spread added to LIBOR rate for one month based on leverage ratio (in hundredths)         1.10%                            
Line of credit facility, Covenant restriction, Maximum leverage ratio restricting paying of dividends or repurchasing stock       2.00 to 1 2.00 to 1                            
Line of credit facility, Covenant restriction, Minimum leverage ratio restricting ability to make acquisitions       2.75 to 1 2.75 to 1                            
Line of credit facility, Covenant restriction, Maximum level that can be paid for acquisitions       25,000 25,000                            
Line of credit facility, Covenant restriction, Maximum leverage ratio under amended Private Shelf Agreement       3.00 to 1                              
Original debt amount owed to previous owners of an acquired business $ 750   $ 1,500