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Derivative instruments - Additional Information (Detail) In Millions, unless otherwise specified |  | 0 Months Ended | 12 Months Ended
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Sep. 30, 2010 Cross-currency swap [Member] Designated as Hedging Instrument [Member] Pay Euros [Member] EUR (€) | Sep. 30, 2010 Cross-currency swap [Member] Designated as Hedging Instrument [Member] Receive U.S. dollars [Member] USD ($) | Jun. 30, 2008 Interest Rate Swap [Member] De-designated hedges [Member] USD ($) | Dec. 31, 2010 Interest Rate Swap [Member] De-designated hedges [Member] USD ($)
Derivatives, Fair Value [Line Items] |  |  |  |
Notional amount | € 28.7 | $ 39.0 | $ 150.0 |
Fixed rate (as a percent) | 5.00% | 4.635% |  |
Gain on settlement of derivative instrument |  |  |  | $ 1.3
Period of amortizable interest rate swap agreement |  |  | 3 years |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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Period Type: | instant

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- Definition The excess or shortfall of realized amounts versus previously recorded fair value upon settlement of derivative instruments. + References No definition available. + Details
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- Definition Interest Rate Derivative Maturity Period + References No definition available. + Details
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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
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