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Derivative Instrument and Hedging Activities - Interest Rate Swap Agreement (Parenthetical) (Detail) | Dec. 31, 2012 USD ($) | Dec. 31, 2012 EUR (€) | Dec. 31, 2012 Interest rate swap agreements [Member] EUR (€) | Dec. 31, 2012 Floating Rate Payable [Member] USD ($) | Dec. 31, 2012 Floating Rate Receivable [Member]
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Derivative [Line Items] |  |  |  |  |
Minimum variable interest rate on debt | 0.30% | 0.30% |  |  |
Maximum variable interest rate on debt | 4.25% | 4.25% |  |  |
Principal Amount |  |  | € 258,800,000 | $ 200,000,000 |
LIBOR fixed |  |  |  | 2.14% | 1.12%
Floating LIBOR rate receivable/payable cap |  |  |  | 6.00% | 3.50%
Effective reduction rate should rate exceed LIBOR rate |  |  |  |  | 2.38%
Reducing principal amount of Euro-denominated interest rate swaps | $ 92,500,000 | € 70,100,000 |  |  |

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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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- Definition Effective Reduction Rate Should Rate Exceed Libor Rate + References No definition available. + Details
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- Definition Reducing principal amount of euro denominated interest rate swaps. + References No definition available. + Details
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- Definition Cap rate on an interest rate derivative such as an interest rate cap or collar. If market rates exceed the cap rate, a payment or receipt is triggered on the contract. + 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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- Definition High end of the range of percentage points added to the reference rate to compute the variable rate on the group of interest rate derivatives. + References No definition available. + Details
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- Details
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- Definition Low end of the range of percentage points added to the reference rate to compute the variable rate on the group of interest rate derivatives. + References No definition available. + Details
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