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Income taxes - Additional Information (Detail) In Millions, unless otherwise specified |  | 3 Months Ended |
--- | --- | --- | ---
Mar. 31, 2013 USD ($) | Mar. 31, 2013 Proposed adjustment to certain foreign tax liabilities [Member] USD ($) | Mar. 31, 2013 Proposed adjustment to certain foreign tax liabilities [Member] CAD
Income Taxes Disclosure [Line Items] |  |  |
Letter of credit collateralized |  |  | 7.5
Potential cash tax liability full amount for the proposed adjustment |  | 15.7 |
Unrecognized tax benefits | $ 4.4 |  |

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- Definition The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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- Definition Potential cash tax liability full amount for the proposed adjustment. + References No definition available. + Details
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