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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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The minimum restrictions on the entity's ability to pay dividends and repurchases of common stock based on the company's leverage ratio after giving effect to such payments. + References No definition available. + Details
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- Definition Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number APB14-1 -Paragraph 31 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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