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Debt (Details) In Thousands, unless otherwise specified | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Dec. 31, 2011 USD ($) | Dec. 31, 2010 USD ($) | Dec. 31, 2011 Amended Prudential Investment Management [Member] USD ($) | Dec. 31, 2011 JPMorgan Chase Bank, National Association [Member] USD ($) | Dec. 31, 2010 The Royak Bank of Scotland N.V. [Member] USD ($) | Dec. 31, 2010 The Royak Bank of Scotland N.V. [Member] EUR (€) | Dec. 31, 2011 Series A Notes [Member] USD ($) | Dec. 31, 2011 Series B Notes [Member] USD ($) | Dec. 31, 2011 Short Term [Member] Bank Borrowings [Member] USD ($) | Dec. 31, 2010 Short Term [Member] Bank Borrowings [Member] USD ($) | Dec. 31, 2011 Long Term [Member] USD ($) | Dec. 31, 2010 Long Term [Member] USD ($) | Dec. 31, 2011 Long Term [Member] Bank Borrowings [Member] USD ($) | Dec. 31, 2010 Long Term [Member] Bank Borrowings [Member] USD ($) | Dec. 31, 2011 Long Term [Member] Credit Facility Borrowings [Member] USD ($) | Dec. 31, 2010 Long Term [Member] Credit Facility Borrowings [Member] USD ($) | Dec. 31, 2011 Long Term [Member] Notes Payable [Member] USD ($) | Dec. 31, 2010 Long Term [Member] Notes Payable [Member] USD ($) | Dec. 31, 2011 Long Term [Member] Collateralized Borrowings [Member] USD ($) | Dec. 31, 2010 Long Term [Member] Collateralized Borrowings [Member] USD ($) | Dec. 31, 2011 Long Term [Member] Capital Lease Obligations [Member] USD ($) | Dec. 31, 2010 Long Term [Member] Capital Lease Obligations [Member] USD ($)
Short-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bank borrowings |  |  |  |  |  |  |  |  | $ 0 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Unclassified [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, gross amount outstanding | 36,455 |  |  |  |  |  |  |  |  |  | 36,455 | 30,828 | 49 | 128 | 30,000 | 25,000 | 1,500 | 0 | 127 | 471 | 4,779 | 5,229
Less: current portion | 4,166 | 3,154 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term portion | 32,289 | 27,674 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 | 1,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Uncommitted lines of credit | 82,592 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, Amount outstanding |  |  | 20,000 | 10,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit, Outstanding amount | 1,759 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bank guarantees | 1,015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fees on unused lines of credit | 338 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  | 0.54 to 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
EBITDA to interest expense ratio |  |  |  | 32.81 to 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit Facilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, Maximum borrowing capacity |  |  |  | 125,000 | 2,592 | 2,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, Expiration date |  |  |  | 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) |  |  |  | 1.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 | 3.00 to 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate maturities of outstanding debt including capital lease obligations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2012 | 5,354 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2013 | 3,096 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2014 | 3,211 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2015 | 4,252 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2016 | 13,994 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Thereafter | 11,995 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total minimum obligations | 41,902 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Less: amount representing interest | (5,447) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total | $ 36,455 |  |  |  |  |  |  |  |  |  | $ 36,455 | $ 30,828 | $ 49 | $ 128 | $ 30,000 | $ 25,000 | $ 1,500 | $ 0 | $ 127 | $ 471 | $ 4,779 | $ 5,229

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- Definition The maximum amount of borrowing capacity under a line of credit that is available as of the balance sheet date for foreign subsidiaries of the entity. + References No definition available. + Details
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- Definition The minimum Line of credit facility restrictive covenant on EBITDA to interest expense ratio. + References No definition available. + Details
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- Definition The minimum fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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- Definition The minimum amount of additional margin spread added to LIBOR one month interest rate. + References No definition available. + Details
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- Definition The maximum 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 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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