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Long-term debt - Additional Information (Detail) | 3 Months Ended |  |  | 1 Months Ended | 3 Months Ended |  |  |  |  | 1 Months Ended | 3 Months Ended |  | 3 Months Ended |  |  |
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Mar. 31, 2012 USD ($) | Mar. 31, 2013 USD ($) | Mar. 31, 2013 EUR (€) | Dec. 31, 2012 USD ($) | Dec. 31, 2012 EUR (€) | Sep. 30, 2012 Revolving Credit Facility [Member] USD ($) | Jun. 30, 2012 Revolving Credit Facility [Member] USD ($) | May 31, 2012 Revolving Credit Facility [Member] USD ($) | Aug. 31, 2010 Revolving Credit Facility [Member] | Mar. 31, 2013 Revolving Credit Facility [Member] USD ($) | Dec. 31, 2012 Revolving Credit Facility [Member] USD ($) | Aug. 30, 2010 Revolving Credit Facility [Member] USD ($) | Mar. 31, 2013 Revolving Credit Facility [Member] LIBOR [Member] | Dec. 31, 2012 Revolving Credit Facility [Member] LIBOR [Member] | May 31, 2012 Term Loan Facility [Member] USD ($) | Aug. 31, 2010 Term Loan Facility [Member] USD ($) | Mar. 31, 2013 Term Loan Facility [Member] USD ($) | Dec. 31, 2012 Term Loan Facility [Member] USD ($) | Mar. 31, 2013 Term Loan Facility [Member] Base rate [Member] Maximum [Member] | Aug. 31, 2010 New Credit Agreement [Member] USD ($) | Mar. 31, 2013 New Credit Agreement [Member] LIBOR [Member] Maximum [Member] | Mar. 31, 2013 New Credit Agreement [Member] Base rate [Member] Maximum [Member] | Mar. 31, 2013 Prior Credit Agreement [Member] LIBOR [Member] | Dec. 31, 2012 Prior Credit Agreement [Member] LIBOR [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument term (in years) |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 7,400,000 |  | € 5,800,000 | $ 7,600,000 | € 5,800,000 |  |  |  |  |  |  | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  |  |  |  |  |  |
Maximum additional borrowing capacity available |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  |  |  |
Repayment of debt obligation | 3,750,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 87,500,000 |  |  |  |  |  |  |  |  |
Repayment of debt obligation |  |  |  |  |  |  | 20,000,000 | 20,000,000 | 57,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount outstanding |  | 0 |  |  | 100,000 |  |  |  |  |  | 20,000,000 | 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Margin on variable rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.50% | 2.50% |  |  |  |  |  |  | 3.25% | 2.25% |  |
Variable rate basis |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | LIBOR |  |  |  |  |
Effective interest rate (as a Percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.70% | 2.70%
Revolving credit facility due date |  |  |  |  |  |  |  |  |  |  | Aug. 30, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of restricted net assets |  | 225,200,000 |  |  | 213,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash |  | 29,446,000 | [1] |  | 21,314,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs incurred |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  |  |  |  |  |  |
Write-off of debt issue costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 800,000 |  |  |  |  |  |  |  |  |
Deferred debt issuance costs, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,600,000 | $ 1,800,000 |  |  |  |  |  |
[1] | Unaudited

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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