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Long-term debt - Additional Information (Detail) | 12 Months Ended |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  | 12 Months Ended |  |  |  |
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Dec. 31, 2012 USD ($) | Dec. 31, 2011 USD ($) | Dec. 31, 2010 USD ($) | Dec. 31, 2012 EUR (€) | Dec. 31, 2011 EUR (€) | Dec. 31, 2012 LIBOR [Member] | May 31, 2012 Revolving Credit Facility [Member] USD ($) | Aug. 31, 2010 Revolving Credit Facility [Member] | Dec. 31, 2012 Revolving Credit Facility [Member] USD ($) | Sep. 30, 2012 Revolving Credit Facility [Member] USD ($) | Jun. 30, 2012 Revolving Credit Facility [Member] USD ($) | Dec. 31, 2011 Revolving Credit Facility [Member] USD ($) | Aug. 30, 2010 Revolving Credit Facility [Member] USD ($) | Dec. 31, 2011 Revolving Credit Facility [Member] LIBOR [Member] USD ($) | Dec. 31, 2011 Revolving Credit Facility [Member] Base rate [Member] USD ($) | May 31, 2012 Term Loan Facility [Member] USD ($) | May 31, 2011 Term Loan Facility [Member] USD ($) | Aug. 31, 2010 Term Loan Facility [Member] USD ($) | Dec. 31, 2011 Term Loan Facility [Member] USD ($) | Dec. 31, 2012 Term Loan Facility [Member] USD ($) | Dec. 31, 2011 Term Loan Facility [Member] LIBOR [Member] USD ($) | Dec. 31, 2011 Term Loan Facility [Member] Base rate [Member] Maximum [Member] | Aug. 31, 2010 New Credit Agreement [Member] USD ($) | Dec. 31, 2011 New Credit Agreement [Member] LIBOR [Member] Maximum [Member] | Dec. 31, 2011 New Credit Agreement [Member] Base rate [Member] Maximum [Member] | Dec. 31, 2012 Prior Credit Agreement [Member] | Dec. 31, 2011 Prior Credit Agreement [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument term (in years) |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 7,600,000 | $ 8,100,000 |  | € 5,800,000 | € 6,300,000 |  |  |  |  |  |  |  | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  |  |  |  |  |  |  |
Maximum additional borrowing capacity available |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  |  |  |
Repayment of debt obligation | 188,695,000 | 7,500,000 | 36,269,000 |  |  |  |  |  |  |  |  |  |  |  |  | 87,500,000 |  |  |  |  |  |  |  |  |  |  |
Repayment of debt obligation |  |  |  |  |  |  | 57,500,000 |  | 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount outstanding | 100,000 | 1,300,000 |  |  |  |  |  |  |  | 20,000,000 | 20,000,000 | 117,400,000 |  |  |  |  |  |  | 91,300,000 |  |  |  |  |  |  |  |
Margin on variable rate |  |  |  |  |  | 2.50% |  |  |  |  |  |  |  | 3.00% | 2.00% |  |  |  |  |  | 3.00% |  |  | 3.25% | 2.25% |  |
Variable rate basis |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | LIBOR |  |  |  |  |
Portion of credit facility charged at variable rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 | 17,400,000 |  |  |  |  |  | 100,000,000 |  |  |  |  |  |
Effective interest rate (as a Percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.70% | 3.40%
Amount of restricted net assets | 247,400,000 | 186,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash | 21,314,000 | 45,476,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs incurred |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 800,000 |  | 5,000,000 |  |  |  |  |  |  |  |
Deferred debt issuance costs, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,500,000 | $ 1,800,000 |  |  |  |  |  |  |

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- Definition The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -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 -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -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. + Details
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